51977421 has 12 divisors (see below), whose sum is σ = 77500800. Its totient is φ = 33533640.

The previous prime is 51977383. The next prime is 51977423. The reversal of 51977421 is 12477915.

It is a happy number.

51977421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51977421 - 2¹⁵ = 51944653 is a prime.

It is a super-2 number, since 2×51977421² = 5403304587622482, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51977423) 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 11 ways as a sum of consecutive naturals, for example, 92871 + ... + 93428.

It is an arithmetic number, because the mean of its divisors is an integer number (6458400).

Almost surely, 2^51977421 is an apocalyptic number.

It is an amenable number.

51977421 is a deficient number, since it is larger than the sum of its proper divisors (25523379).

51977421 is a wasteful number, since it uses less digits than its factorization.

51977421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186336 (or 186333 counting only the distinct ones).

The product of its digits is 17640, while the sum is 36.

The square root of 51977421 is about 7209.5368089774. The cubic root of 51977421 is about 373.1970845469.

The spelling of 51977421 in words is "fifty-one million, nine hundred seventy-seven thousand, four hundred twenty-one".