51265631 has 4 divisors (see below), whose sum is σ = 52134600. Its totient is φ = 50396664.

The previous prime is 51265607. The next prime is 51265633. The reversal of 51265631 is 13656215.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13656215 = 5 ⋅2731243.

It is a cyclic number.

It is not a de Polignac number, because 51265631 - 2¹⁸ = 51003487 is a prime.

It is a super-2 number, since 2×51265631² = 5256329843656322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51265594 and 51265603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51265633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 434396 + ... + 434513.

It is an arithmetic number, because the mean of its divisors is an integer number (13033650).

Almost surely, 2^51265631 is an apocalyptic number.

51265631 is a deficient number, since it is larger than the sum of its proper divisors (868969).

51265631 is an equidigital number, since it uses as much as digits as its factorization.

51265631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868968.

The product of its digits is 5400, while the sum is 29.

The square root of 51265631 is about 7160.0021648041. The cubic root of 51265631 is about 371.4857015039.

The spelling of 51265631 in words is "fifty-one million, two hundred sixty-five thousand, six hundred thirty-one".