90940171879 has 2 divisors, whose sum is σ = 90940171880. Its totient is φ = 90940171878.

The previous prime is 90940171801. The next prime is 90940171919. The reversal of 90940171879 is 97817104909.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90940171879 - 2¹⁵ = 90940139111 is a prime.

It is a super-2 number, since 2×90940171879² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90940172879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45470085939 + 45470085940.

It is an arithmetic number, because the mean of its divisors is an integer number (45470085940).

Almost surely, 2^90940171879 is an apocalyptic number.

90940171879 is a deficient number, since it is larger than the sum of its proper divisors (1).

90940171879 is an equidigital number, since it uses as much as digits as its factorization.

90940171879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1143072, while the sum is 55.

The spelling of 90940171879 in words is "ninety billion, nine hundred forty million, one hundred seventy-one thousand, eight hundred seventy-nine".