51638927 has 2 divisors, whose sum is σ = 51638928. Its totient is φ = 51638926.

The previous prime is 51638897. The next prime is 51638929. The reversal of 51638927 is 72983615.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51638927 - 2⁶ = 51638863 is a prime.

It is a super-2 number, since 2×51638927² = 5333157563422658, which contains 22 as substring.

Together with 51638929, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51638929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25819463 + 25819464.

It is an arithmetic number, because the mean of its divisors is an integer number (25819464).

Almost surely, 2^51638927 is an apocalyptic number.

51638927 is a deficient number, since it is larger than the sum of its proper divisors (1).

51638927 is an equidigital number, since it uses as much as digits as its factorization.

51638927 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 41.

The square root of 51638927 is about 7186.0230308565. The cubic root of 51638927 is about 372.3851923114.

The spelling of 51638927 in words is "fifty-one million, six hundred thirty-eight thousand, nine hundred twenty-seven".