90039598991 has 2 divisors, whose sum is σ = 90039598992. Its totient is φ = 90039598990.

The previous prime is 90039598969. The next prime is 90039598993. The reversal of 90039598991 is 19989593009.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90039598991 is a prime.

Together with 90039598993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90039598993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45019799495 + 45019799496.

It is an arithmetic number, because the mean of its divisors is an integer number (45019799496).

Almost surely, 2^90039598991 is an apocalyptic number.

90039598991 is a deficient number, since it is larger than the sum of its proper divisors (1).

90039598991 is an equidigital number, since it uses as much as digits as its factorization.

90039598991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7085880, while the sum is 62.

The spelling of 90039598991 in words is "ninety billion, thirty-nine million, five hundred ninety-eight thousand, nine hundred ninety-one".