51515983 has 2 divisors, whose sum is σ = 51515984. Its totient is φ = 51515982.

The previous prime is 51515963. The next prime is 51515999. The reversal of 51515983 is 38951515.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51515983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51515923) 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, 25757991 + 25757992.

It is an arithmetic number, because the mean of its divisors is an integer number (25757992).

Almost surely, 2^51515983 is an apocalyptic number.

51515983 is a deficient number, since it is larger than the sum of its proper divisors (1).

51515983 is an equidigital number, since it uses as much as digits as its factorization.

51515983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27000, while the sum is 37.

The square root of 51515983 is about 7177.4635491934. The cubic root of 51515983 is about 372.0894276657.

The spelling of 51515983 in words is "fifty-one million, five hundred fifteen thousand, nine hundred eighty-three".