90919561907 has 2 divisors, whose sum is σ = 90919561908. Its totient is φ = 90919561906.

The previous prime is 90919561877. The next prime is 90919561921. The reversal of 90919561907 is 70916591909.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90919561907 - 2⁸ = 90919561651 is a prime.

It is not a weakly prime, because it can be changed into another prime (90919561937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45459780953 + 45459780954.

It is an arithmetic number, because the mean of its divisors is an integer number (45459780954).

Almost surely, 2^90919561907 is an apocalyptic number.

90919561907 is a deficient number, since it is larger than the sum of its proper divisors (1).

90919561907 is an equidigital number, since it uses as much as digits as its factorization.

90919561907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1377810, while the sum is 56.

The spelling of 90919561907 in words is "ninety billion, nine hundred nineteen million, five hundred sixty-one thousand, nine hundred seven".