90909089951 has 2 divisors, whose sum is σ = 90909089952. Its totient is φ = 90909089950.

The previous prime is 90909089893. The next prime is 90909089977. The reversal of 90909089951 is 15998090909.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90909089951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90909089351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45454544975 + 45454544976.

It is an arithmetic number, because the mean of its divisors is an integer number (45454544976).

Almost surely, 2^90909089951 is an apocalyptic number.

90909089951 is a deficient number, since it is larger than the sum of its proper divisors (1).

90909089951 is an equidigital number, since it uses as much as digits as its factorization.

90909089951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2361960, while the sum is 59.

The spelling of 90909089951 in words is "ninety billion, nine hundred nine million, eighty-nine thousand, nine hundred fifty-one".