51631133 has 4 divisors (see below), whose sum is σ = 52002720. Its totient is φ = 51259548.

The previous prime is 51631127. The next prime is 51631141. The reversal of 51631133 is 33113615.

It is a happy number.

51631133 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51631133 - 2¹⁶ = 51565597 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51631099 and 51631108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51631183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185585 + ... + 185862.

It is an arithmetic number, because the mean of its divisors is an integer number (13000680).

Almost surely, 2^51631133 is an apocalyptic number.

It is an amenable number.

51631133 is a deficient number, since it is larger than the sum of its proper divisors (371587).

51631133 is a wasteful number, since it uses less digits than its factorization.

51631133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371586.

The product of its digits is 810, while the sum is 23.

The square root of 51631133 is about 7185.4807076493. The cubic root of 51631133 is about 372.3664563410.

Adding to 51631133 its reverse (33113615), we get a palindrome (84744748).

The spelling of 51631133 in words is "fifty-one million, six hundred thirty-one thousand, one hundred thirty-three".