51261612 has 12 divisors (see below), whose sum is σ = 119610456. Its totient is φ = 17087200.

The previous prime is 51261611. The next prime is 51261629. The reversal of 51261612 is 21616215.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (51261611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2135889 + ... + 2135912.

It is an arithmetic number, because the mean of its divisors is an integer number (9967538).

Almost surely, 2^51261612 is an apocalyptic number.

It is an amenable number.

51261612 is an abundant number, since it is smaller than the sum of its proper divisors (68348844).

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

51261612 is a wasteful number, since it uses less digits than its factorization.

51261612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4271808 (or 4271806 counting only the distinct ones).

The product of its digits is 720, while the sum is 24.

The square root of 51261612 is about 7159.7215029636. The cubic root of 51261612 is about 371.4759936352.

Adding to 51261612 its reverse (21616215), we get a palindrome (72877827).

The spelling of 51261612 in words is "fifty-one million, two hundred sixty-one thousand, six hundred twelve".