51131898 has 40 divisors (see below), whose sum is σ = 119563488. Its totient is φ = 16301736.

The previous prime is 51131867. The next prime is 51131923. The reversal of 51131898 is 89813115.

It is a super-2 number, since 2×51131898² = 5228941986164808, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3136 + ... + 10587.

Almost surely, 2^51131898 is an apocalyptic number.

51131898 is an abundant number, since it is smaller than the sum of its proper divisors (68431590).

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

51131898 is a wasteful number, since it uses less digits than its factorization.

51131898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13760 (or 13751 counting only the distinct ones).

The product of its digits is 8640, while the sum is 36.

The square root of 51131898 is about 7150.6571725961. The cubic root of 51131898 is about 371.1623974510.

The spelling of 51131898 in words is "fifty-one million, one hundred thirty-one thousand, eight hundred ninety-eight".