90890190431 has 2 divisors, whose sum is σ = 90890190432. Its totient is φ = 90890190430.

The previous prime is 90890190371. The next prime is 90890190449. The reversal of 90890190431 is 13409109809.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90890190431 - 2¹⁰ = 90890189407 is a prime.

It is a super-2 number, since 2×90890190431² (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 (90890190331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45445095215 + 45445095216.

It is an arithmetic number, because the mean of its divisors is an integer number (45445095216).

Almost surely, 2^90890190431 is an apocalyptic number.

90890190431 is a deficient number, since it is larger than the sum of its proper divisors (1).

90890190431 is an equidigital number, since it uses as much as digits as its factorization.

90890190431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 44.

The spelling of 90890190431 in words is "ninety billion, eight hundred ninety million, one hundred ninety thousand, four hundred thirty-one".