9975581491 has 2 divisors, whose sum is σ = 9975581492. Its totient is φ = 9975581490.

The previous prime is 9975581479. The next prime is 9975581509. The reversal of 9975581491 is 1941855799.

9975581491 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9975581491 - 2²³ = 9967192883 is a prime.

It is not a weakly prime, because it can be changed into another prime (9975581461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4987790745 + 4987790746.

It is an arithmetic number, because the mean of its divisors is an integer number (4987790746).

Almost surely, 2^9975581491 is an apocalyptic number.

9975581491 is a deficient number, since it is larger than the sum of its proper divisors (1).

9975581491 is an equidigital number, since it uses as much as digits as its factorization.

9975581491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4082400, while the sum is 58.

The square root of 9975581491 is about 99877.8328309140. The cubic root of 9975581491 is about 2152.6796579846.

The spelling of 9975581491 in words is "nine billion, nine hundred seventy-five million, five hundred eighty-one thousand, four hundred ninety-one".