51212690 has 16 divisors (see below), whose sum is σ = 94431960. Its totient is φ = 19985280.

The previous prime is 51212677. The next prime is 51212717. The reversal of 51212690 is 9621215.

It can be written as a sum of positive squares in 4 ways, for example, as 13476241 + 37736449 = 3671^2 + 6143^2 .

It is a super-2 number, since 2×51212690² = 5245479234072200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62045 + ... + 62864.

Almost surely, 2^51212690 is an apocalyptic number.

51212690 is a deficient number, since it is larger than the sum of its proper divisors (43219270).

51212690 is a wasteful number, since it uses less digits than its factorization.

51212690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124957.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 51212690 is about 7156.3042137684. The cubic root of 51212690 is about 371.3577821560.

The spelling of 51212690 in words is "fifty-one million, two hundred twelve thousand, six hundred ninety".