51015599 has 2 divisors, whose sum is σ = 51015600. Its totient is φ = 51015598.

The previous prime is 51015533. The next prime is 51015607. The reversal of 51015599 is 99551015.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51015599 - 2²⁴ = 34238383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51015509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25507799 + 25507800.

It is an arithmetic number, because the mean of its divisors is an integer number (25507800).

Almost surely, 2^51015599 is an apocalyptic number.

51015599 is a deficient number, since it is larger than the sum of its proper divisors (1).

51015599 is an equidigital number, since it uses as much as digits as its factorization.

51015599 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10125, while the sum is 35.

The square root of 51015599 is about 7142.5204934953. The cubic root of 51015599 is about 370.8807820895.

The spelling of 51015599 in words is "fifty-one million, fifteen thousand, five hundred ninety-nine".