90850591 has 16 divisors (see below), whose sum is σ = 102009600. Its totient is φ = 80333568.

The previous prime is 90850589. The next prime is 90850631. The reversal of 90850591 is 19505809.

It is a cyclic number.

It is not a de Polignac number, because 90850591 - 2¹ = 90850589 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90850591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90850541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50770 + ... + 52528.

It is an arithmetic number, because the mean of its divisors is an integer number (6375600).

Almost surely, 2^90850591 is an apocalyptic number.

90850591 is a deficient number, since it is larger than the sum of its proper divisors (11159009).

90850591 is a wasteful number, since it uses less digits than its factorization.

90850591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1938.

The product of its (nonzero) digits is 16200, while the sum is 37.

The square root of 90850591 is about 9531.5576376582. The cubic root of 90850591 is about 449.5478437718.

The spelling of 90850591 in words is "ninety million, eight hundred fifty thousand, five hundred ninety-one".