90437198591 has 2 divisors, whose sum is σ = 90437198592. Its totient is φ = 90437198590.

The previous prime is 90437198543. The next prime is 90437198623. The reversal of 90437198591 is 19589173409.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90437198591 - 2¹⁴ = 90437182207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90437198531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45218599295 + 45218599296.

It is an arithmetic number, because the mean of its divisors is an integer number (45218599296).

Almost surely, 2^90437198591 is an apocalyptic number.

90437198591 is a deficient number, since it is larger than the sum of its proper divisors (1).

90437198591 is an equidigital number, since it uses as much as digits as its factorization.

90437198591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2449440, while the sum is 56.

The spelling of 90437198591 in words is "ninety billion, four hundred thirty-seven million, one hundred ninety-eight thousand, five hundred ninety-one".