51656598 has 96 divisors (see below), whose sum is σ = 134933760. Its totient is φ = 13970880.

The previous prime is 51656593. The next prime is 51656603. The reversal of 51656598 is 89565615.

It is a happy number.

51656598 is a `hidden beast` number, since 5 + 1 + 6 + 56 + 598 = 666.

51656598 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51656593) and next prime (51656603).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51656593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 244713 + ... + 244923.

It is an arithmetic number, because the mean of its divisors is an integer number (1405560).

Almost surely, 2^51656598 is an apocalyptic number.

51656598 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 51656598, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67466880).

51656598 is an abundant number, since it is smaller than the sum of its proper divisors (83277162).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51656598 is a wasteful number, since it uses less digits than its factorization.

51656598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322 (or 319 counting only the distinct ones).

The product of its digits is 324000, while the sum is 45.

The square root of 51656598 is about 7187.2524653027. The cubic root of 51656598 is about 372.4276645873.

The spelling of 51656598 in words is "fifty-one million, six hundred fifty-six thousand, five hundred ninety-eight".