51526613 has 6 divisors (see below), whose sum is σ = 54381654. Its totient is φ = 48814344.

The previous prime is 51526597. The next prime is 51526621. The reversal of 51526613 is 31662515.

It can be written as a sum of positive squares in only one way, i.e., 32924644 + 18601969 = 5738^2 + 4313^2 .

It is not a de Polignac number, because 51526613 - 2⁴ = 51526597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51526633) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71006 + ... + 71727.

It is an arithmetic number, because the mean of its divisors is an integer number (9063609).

Almost surely, 2^51526613 is an apocalyptic number.

It is an amenable number.

51526613 is a deficient number, since it is larger than the sum of its proper divisors (2855041).

51526613 is a wasteful number, since it uses less digits than its factorization.

51526613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142771 (or 142752 counting only the distinct ones).

The product of its digits is 5400, while the sum is 29.

The square root of 51526613 is about 7178.2040232916. The cubic root of 51526613 is about 372.1150186789.

The spelling of 51526613 in words is "fifty-one million, five hundred twenty-six thousand, six hundred thirteen".