51032131 has 4 divisors (see below), whose sum is σ = 51049600. Its totient is φ = 51014664.

The previous prime is 51032087. The next prime is 51032143. The reversal of 51032131 is 13123015.

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 51032131 - 2¹³ = 51023939 is a prime.

It is a super-2 number, since 2×51032131² = 5208556788802322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51032161) 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, 3171 + ... + 10588.

It is an arithmetic number, because the mean of its divisors is an integer number (12762400).

Almost surely, 2^51032131 is an apocalyptic number.

51032131 is a deficient number, since it is larger than the sum of its proper divisors (17469).

51032131 is a wasteful number, since it uses less digits than its factorization.

51032131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17468.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 51032131 is about 7143.6776942972. The cubic root of 51032131 is about 370.9208400261.

Adding to 51032131 its reverse (13123015), we get a palindrome (64155146).

The spelling of 51032131 in words is "fifty-one million, thirty-two thousand, one hundred thirty-one".