51156513 has 6 divisors (see below), whose sum is σ = 73892754. Its totient is φ = 34104336.

The previous prime is 51156503. The next prime is 51156517. The reversal of 51156513 is 31565115.

51156513 is a `hidden beast` number, since 5 + 1 + 1 + 5 + 651 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 44515584 + 6640929 = 6672^2 + 2577^2 .

It is not a de Polignac number, because 51156513 - 2¹⁴ = 51140129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51156517) 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, 2842020 + ... + 2842037.

It is an arithmetic number, because the mean of its divisors is an integer number (12315459).

Almost surely, 2^51156513 is an apocalyptic number.

It is an amenable number.

51156513 is a deficient number, since it is larger than the sum of its proper divisors (22736241).

51156513 is a wasteful number, since it uses less digits than its factorization.

51156513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5684063 (or 5684060 counting only the distinct ones).

The product of its digits is 2250, while the sum is 27.

The square root of 51156513 is about 7152.3781359769. The cubic root of 51156513 is about 371.2219473413.

It can be divided in two parts, 5115 and 6513, that added together give a triangular number (11628 = T₁₅₂).

The spelling of 51156513 in words is "fifty-one million, one hundred fifty-six thousand, five hundred thirteen".