51115973 has 2 divisors, whose sum is σ = 51115974. Its totient is φ = 51115972.

The previous prime is 51115943. The next prime is 51115979. The reversal of 51115973 is 37951115.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44649124 + 6466849 = 6682^2 + 2543^2 .

It is a cyclic number.

It is not a de Polignac number, because 51115973 - 2¹⁴ = 51099589 is a prime.

It is a super-2 number, since 2×51115973² = 5225685391473458, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51115979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25557986 + 25557987.

It is an arithmetic number, because the mean of its divisors is an integer number (25557987).

Almost surely, 2^51115973 is an apocalyptic number.

It is an amenable number.

51115973 is a deficient number, since it is larger than the sum of its proper divisors (1).

51115973 is an equidigital number, since it uses as much as digits as its factorization.

51115973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4725, while the sum is 32.

The square root of 51115973 is about 7149.5435518640. The cubic root of 51115973 is about 371.1238606787.

The spelling of 51115973 in words is "fifty-one million, one hundred fifteen thousand, nine hundred seventy-three".