51516973 has 2 divisors, whose sum is σ = 51516974. Its totient is φ = 51516972.

The previous prime is 51516943. The next prime is 51516977. The reversal of 51516973 is 37961515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44129449 + 7387524 = 6643^2 + 2718^2 .

It is a cyclic number.

It is not a de Polignac number, because 51516973 - 2⁹ = 51516461 is a prime.

It is equal to p_3086596 and since 51516973 and 3086596 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51516977) 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 as a sum of consecutive naturals, namely, 25758486 + 25758487.

It is an arithmetic number, because the mean of its divisors is an integer number (25758487).

Almost surely, 2^51516973 is an apocalyptic number.

It is an amenable number.

51516973 is a deficient number, since it is larger than the sum of its proper divisors (1).

51516973 is an equidigital number, since it uses as much as digits as its factorization.

51516973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28350, while the sum is 37.

The square root of 51516973 is about 7177.5325147296. The cubic root of 51516973 is about 372.0918111731.

The spelling of 51516973 in words is "fifty-one million, five hundred sixteen thousand, nine hundred seventy-three".