51495986 has 4 divisors (see below), whose sum is σ = 77243982. Its totient is φ = 25747992.

The previous prime is 51495949. The next prime is 51496001. The reversal of 51495986 is 68959415.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 49970761 + 1525225 = 7069^2 + 1235^2 .

It is a super-2 number, since 2×51495986² = 5303673148224392, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51495986.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12873995 + ... + 12873998.

Almost surely, 2^51495986 is an apocalyptic number.

51495986 is a deficient number, since it is larger than the sum of its proper divisors (25747996).

51495986 is a wasteful number, since it uses less digits than its factorization.

51495986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25747995.

The product of its digits is 388800, while the sum is 47.

The square root of 51495986 is about 7176.0703731220. The cubic root of 51495986 is about 372.0412766855.

The spelling of 51495986 in words is "fifty-one million, four hundred ninety-five thousand, nine hundred eighty-six".