51517591 has 2 divisors, whose sum is σ = 51517592. Its totient is φ = 51517590.

The previous prime is 51517553. The next prime is 51517597. The reversal of 51517591 is 19571515.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51517591 - 2²⁵ = 17963159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51517597) 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, 25758795 + 25758796.

It is an arithmetic number, because the mean of its divisors is an integer number (25758796).

Almost surely, 2^51517591 is an apocalyptic number.

51517591 is a deficient number, since it is larger than the sum of its proper divisors (1).

51517591 is an equidigital number, since it uses as much as digits as its factorization.

51517591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7875, while the sum is 34.

The square root of 51517591 is about 7177.5755656071. The cubic root of 51517591 is about 372.0932990440.

The spelling of 51517591 in words is "fifty-one million, five hundred seventeen thousand, five hundred ninety-one".