51621164 has 24 divisors (see below), whose sum is σ = 103638528. Its totient is φ = 22038480.

The previous prime is 51621161. The next prime is 51621209. The reversal of 51621164 is 46112615.

51621164 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (51621161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4187 + ... + 10989.

It is an arithmetic number, because the mean of its divisors is an integer number (4318272).

Almost surely, 2^51621164 is an apocalyptic number.

It is an amenable number.

51621164 is an abundant number, since it is smaller than the sum of its proper divisors (52017364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51621164 is a wasteful number, since it uses less digits than its factorization.

51621164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7085 (or 7083 counting only the distinct ones).

The product of its digits is 1440, while the sum is 26.

The square root of 51621164 is about 7184.7869836203. The cubic root of 51621164 is about 372.3424891470.

Adding to 51621164 its reverse (46112615), we get a palindrome (97733779).

The spelling of 51621164 in words is "fifty-one million, six hundred twenty-one thousand, one hundred sixty-four".