51010631 has 4 divisors (see below), whose sum is σ = 58297872. Its totient is φ = 43723392.

The previous prime is 51010627. The next prime is 51010639. The reversal of 51010631 is 13601015.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51010631 - 2² = 51010627 is a prime.

It is a super-2 number, since 2×51010631² = 5204168950036322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51010639) 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, 3643610 + ... + 3643623.

It is an arithmetic number, because the mean of its divisors is an integer number (14574468).

Almost surely, 2^51010631 is an apocalyptic number.

51010631 is a deficient number, since it is larger than the sum of its proper divisors (7287241).

51010631 is an equidigital number, since it uses as much as digits as its factorization.

51010631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7287240.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 51010631 is about 7142.1727086371. The cubic root of 51010631 is about 370.8687426638.

Adding to 51010631 its reverse (13601015), we get a palindrome (64611646).

The spelling of 51010631 in words is "fifty-one million, ten thousand, six hundred thirty-one".