51581298 has 48 divisors (see below), whose sum is σ = 110873664. Its totient is φ = 15993600.

The previous prime is 51581297. The next prime is 51581317. The reversal of 51581298 is 89218515.

It is a super-4 number, since 4×51581298⁴ (a number of 32 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (51581297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 261736 + ... + 261932.

It is an arithmetic number, because the mean of its divisors is an integer number (2309868).

Almost surely, 2^51581298 is an apocalyptic number.

51581298 is an abundant number, since it is smaller than the sum of its proper divisors (59292366).

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

51581298 is a wasteful number, since it uses less digits than its factorization.

51581298 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387 (or 370 counting only the distinct ones).

The product of its digits is 28800, while the sum is 39.

The square root of 51581298 is about 7182.0121136072. The cubic root of 51581298 is about 372.2466135580.

The spelling of 51581298 in words is "fifty-one million, five hundred eighty-one thousand, two hundred ninety-eight".