9997757591 has 2 divisors, whose sum is σ = 9997757592. Its totient is φ = 9997757590.

The previous prime is 9997757587. The next prime is 9997757617. The reversal of 9997757591 is 1957577999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9997757591 - 2² = 9997757587 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9997757501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4998878795 + 4998878796.

It is an arithmetic number, because the mean of its divisors is an integer number (4998878796).

Almost surely, 2^9997757591 is an apocalyptic number.

9997757591 is a deficient number, since it is larger than the sum of its proper divisors (1).

9997757591 is an equidigital number, since it uses as much as digits as its factorization.

9997757591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56260575, while the sum is 68.

The square root of 9997757591 is about 99988.7873263798. The cubic root of 9997757591 is about 2154.2736405354.

The spelling of 9997757591 in words is "nine billion, nine hundred ninety-seven million, seven hundred fifty-seven thousand, five hundred ninety-one".