51499998 has 48 divisors (see below), whose sum is σ = 125938800. Its totient is φ = 15066240.

The previous prime is 51499997. The next prime is 51499999. The reversal of 51499998 is 89999415.

It is an interprime number because it is at equal distance from previous prime (51499997) and next prime (51499999).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51499997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1258 + ... + 10226.

It is an arithmetic number, because the mean of its divisors is an integer number (2623725).

Almost surely, 2^51499998 is an apocalyptic number.

51499998 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 51499998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62969400).

51499998 is an abundant number, since it is smaller than the sum of its proper divisors (74438802).

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

51499998 is a wasteful number, since it uses less digits than its factorization.

51499998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9017 (or 9014 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 54.

The square root of 51499998 is about 7176.3499078571. The cubic root of 51499998 is about 372.0509382207.

The spelling of 51499998 in words is "fifty-one million, four hundred ninety-nine thousand, nine hundred ninety-eight".