51401690 has 16 divisors (see below), whose sum is σ = 93005928. Its totient is φ = 20453376.

The previous prime is 51401687. The next prime is 51401699. The reversal of 51401690 is 9610415.

It can be written as a sum of positive squares in 4 ways, for example, as 48121969 + 3279721 = 6937^2 + 1811^2 .

It is a super-2 number, since 2×51401690² = 5284267469712200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51401699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11387 + ... + 15246.

Almost surely, 2^51401690 is an apocalyptic number.

51401690 is a deficient number, since it is larger than the sum of its proper divisors (41604238).

51401690 is a wasteful number, since it uses less digits than its factorization.

51401690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26833.

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

The square root of 51401690 is about 7169.4971929697. The cubic root of 51401690 is about 371.8140522483.

The spelling of 51401690 in words is "fifty-one million, four hundred one thousand, six hundred ninety".