51287235898 has 4 divisors (see below), whose sum is σ = 76930853850. Its totient is φ = 25643617948.

The previous prime is 51287235877. The next prime is 51287235949. The reversal of 51287235898 is 89853278215.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89853278215 = 5 ⋅17970655643.

It can be written as a sum of positive squares in only one way, i.e., 51140656449 + 146579449 = 226143^2 + 12107^2 .

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12821808973 + ... + 12821808976.

Almost surely, 2^51287235898 is an apocalyptic number.

51287235898 is a deficient number, since it is larger than the sum of its proper divisors (25643617952).

51287235898 is a wasteful number, since it uses less digits than its factorization.

51287235898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25643617951.

The product of its digits is 9676800, while the sum is 58.

The spelling of 51287235898 in words is "fifty-one billion, two hundred eighty-seven million, two hundred thirty-five thousand, eight hundred ninety-eight".