51373997 has 2 divisors, whose sum is σ = 51373998. Its totient is φ = 51373996.

The previous prime is 51373939. The next prime is 51373999. The reversal of 51373997 is 79937315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36735721 + 14638276 = 6061^2 + 3826^2 .

It is a cyclic number.

It is not a de Polignac number, because 51373997 - 2²⁴ = 34596781 is a prime.

Together with 51373999, 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 (51373999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25686998 + 25686999.

It is an arithmetic number, because the mean of its divisors is an integer number (25686999).

Almost surely, 2^51373997 is an apocalyptic number.

It is an amenable number.

51373997 is a deficient number, since it is larger than the sum of its proper divisors (1).

51373997 is an equidigital number, since it uses as much as digits as its factorization.

51373997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 178605, while the sum is 44.

The square root of 51373997 is about 7167.5656257896. The cubic root of 51373997 is about 371.7472678278.

The spelling of 51373997 in words is "fifty-one million, three hundred seventy-three thousand, nine hundred ninety-seven".