51161013 has 12 divisors (see below), whose sum is σ = 75618400. Its totient is φ = 33313896.

The previous prime is 51160997. The next prime is 51161021. The reversal of 51161013 is 31016115.

51161013 is a `hidden beast` number, since 51 + 1 + 610 + 1 + 3 = 666.

It is not a de Polignac number, because 51161013 - 2⁴ = 51160997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51161063) 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, 65713 + ... + 66486.

Almost surely, 2^51161013 is an apocalyptic number.

It is an amenable number.

51161013 is a deficient number, since it is larger than the sum of its proper divisors (24457387).

51161013 is a wasteful number, since it uses less digits than its factorization.

51161013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132248 (or 132245 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 51161013 is about 7152.6927097423. The cubic root of 51161013 is about 371.2328319102.

Adding to 51161013 its reverse (31016115), we get a palindrome (82177128).

The spelling of 51161013 in words is "fifty-one million, one hundred sixty-one thousand, thirteen".