51401637 has 24 divisors (see below), whose sum is σ = 86590400. Its totient is φ = 29370600.

The previous prime is 51401633. The next prime is 51401639. The reversal of 51401637 is 73610415.

It is not a de Polignac number, because 51401637 - 2² = 51401633 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51401637.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51401633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5239 + ... + 11412.

Almost surely, 2^51401637 is an apocalyptic number.

It is an amenable number.

51401637 is a deficient number, since it is larger than the sum of its proper divisors (35188763).

51401637 is a wasteful number, since it uses less digits than its factorization.

51401637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16678 (or 16661 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 51401637 is about 7169.4934967541. The cubic root of 51401637 is about 371.8139244564.

The spelling of 51401637 in words is "fifty-one million, four hundred one thousand, six hundred thirty-seven".