51237631 has 4 divisors (see below), whose sum is σ = 51765952. Its totient is φ = 50709312.

The previous prime is 51237619. The next prime is 51237671. The reversal of 51237631 is 13673215.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13673215 = 5 ⋅2734643.

It is a cyclic number.

It is not a de Polignac number, because 51237631 - 2¹³ = 51229439 is a prime.

It is a super-2 number, since 2×51237631² = 5250589660984322, which contains 22 as substring.

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 51237631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51237601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264015 + ... + 264208.

It is an arithmetic number, because the mean of its divisors is an integer number (12941488).

Almost surely, 2^51237631 is an apocalyptic number.

51237631 is a deficient number, since it is larger than the sum of its proper divisors (528321).

51237631 is an equidigital number, since it uses as much as digits as its factorization.

51237631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528320.

The product of its digits is 3780, while the sum is 28.

The square root of 51237631 is about 7158.0465910750. The cubic root of 51237631 is about 371.4180571340.

The spelling of 51237631 in words is "fifty-one million, two hundred thirty-seven thousand, six hundred thirty-one".