51164985 has 32 divisors (see below), whose sum is σ = 87108480. Its totient is φ = 25555968.

The previous prime is 51164957. The next prime is 51164989. The reversal of 51164985 is 58946115.

It is not a de Polignac number, because 51164985 - 2⁶ = 51164921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51164989) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71811 + ... + 72519.

It is an arithmetic number, because the mean of its divisors is an integer number (2722140).

Almost surely, 2^51164985 is an apocalyptic number.

It is an amenable number.

51164985 is a deficient number, since it is larger than the sum of its proper divisors (35943495).

51164985 is a wasteful number, since it uses less digits than its factorization.

51164985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017.

The product of its digits is 43200, while the sum is 39.

The square root of 51164985 is about 7152.9703620244. The cubic root of 51164985 is about 371.2424388262.

It can be divided in two parts, 5116 and 4985, that added together give a palindrome (10101).

The spelling of 51164985 in words is "fifty-one million, one hundred sixty-four thousand, nine hundred eighty-five".