51073081 has 2 divisors, whose sum is σ = 51073082. Its totient is φ = 51073080.

The previous prime is 51073073. The next prime is 51073091. The reversal of 51073081 is 18037015.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43560000 + 7513081 = 6600^2 + 2741^2 .

It is a cyclic number.

It is not a de Polignac number, because 51073081 - 2³ = 51073073 is a prime.

It is a super-2 number, since 2×51073081² = 5216919205665122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51073051) 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, 25536540 + 25536541.

It is an arithmetic number, because the mean of its divisors is an integer number (25536541).

Almost surely, 2^51073081 is an apocalyptic number.

It is an amenable number.

51073081 is a deficient number, since it is larger than the sum of its proper divisors (1).

51073081 is an equidigital number, since it uses as much as digits as its factorization.

51073081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 51073081 is about 7146.5432902908. The cubic root of 51073081 is about 371.0200268660.

The spelling of 51073081 in words is "fifty-one million, seventy-three thousand, eighty-one".