90192439991 has 2 divisors, whose sum is σ = 90192439992. Its totient is φ = 90192439990.

The previous prime is 90192439979. The next prime is 90192440053. The reversal of 90192439991 is 19993429109.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90192439991 - 2¹⁸ = 90192177847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90192439091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45096219995 + 45096219996.

It is an arithmetic number, because the mean of its divisors is an integer number (45096219996).

Almost surely, 2^90192439991 is an apocalyptic number.

90192439991 is a deficient number, since it is larger than the sum of its proper divisors (1).

90192439991 is an equidigital number, since it uses as much as digits as its factorization.

90192439991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1417176, while the sum is 56.

The spelling of 90192439991 in words is "ninety billion, one hundred ninety-two million, four hundred thirty-nine thousand, nine hundred ninety-one".