51131311 has 8 divisors (see below), whose sum is σ = 63748224. Its totient is φ = 39842520.

The previous prime is 51131303. The next prime is 51131383. The reversal of 51131311 is 11313115.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51131311 - 2³ = 51131303 is a prime.

It is a super-2 number, since 2×51131311² = 5228821929157442, 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 (51131411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 331945 + ... + 332098.

It is an arithmetic number, because the mean of its divisors is an integer number (7968528).

Almost surely, 2^51131311 is an apocalyptic number.

51131311 is a deficient number, since it is larger than the sum of its proper divisors (12616913).

51131311 is a wasteful number, since it uses less digits than its factorization.

51131311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664061.

The product of its digits is 45, while the sum is 16.

The square root of 51131311 is about 7150.6161272998. The cubic root of 51131311 is about 371.1609771167.

Adding to 51131311 its reverse (11313115), we get a palindrome (62444426).

The spelling of 51131311 in words is "fifty-one million, one hundred thirty-one thousand, three hundred eleven".