51331113 has 12 divisors (see below), whose sum is σ = 74412468. Its totient is φ = 34097280.

The previous prime is 51331081. The next prime is 51331117. The reversal of 51331113 is 31113315.

It can be written as a sum of positive squares in 2 ways, for example, as 29680704 + 21650409 = 5448^2 + 4653^2 .

It is not a de Polignac number, because 51331113 - 2⁵ = 51331081 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51331117) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7620 + ... + 12677.

It is an arithmetic number, because the mean of its divisors is an integer number (6201039).

Almost surely, 2^51331113 is an apocalyptic number.

It is an amenable number.

51331113 is a deficient number, since it is larger than the sum of its proper divisors (23081355).

51331113 is a wasteful number, since it uses less digits than its factorization.

51331113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20584 (or 20581 counting only the distinct ones).

The product of its digits is 135, while the sum is 18.

The square root of 51331113 is about 7164.5734695095. The cubic root of 51331113 is about 371.6438014269.

Adding to 51331113 its reverse (31113315), we get a palindrome (82444428).

It can be divided in two parts, 513 and 31113, that added together give a triangular number (31626 = T₂₅₁).

The spelling of 51331113 in words is "fifty-one million, three hundred thirty-one thousand, one hundred thirteen".