91050561 has 20 divisors (see below), whose sum is σ = 155445312. Its totient is φ = 52028568.

The previous prime is 91050559. The next prime is 91050563. The reversal of 91050561 is 16505019.

It is an interprime number because it is at equal distance from previous prime (91050559) and next prime (91050563).

It is not a de Polignac number, because 91050561 - 2¹ = 91050559 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (91050563) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 79725 + ... + 80858.

Almost surely, 2^91050561 is an apocalyptic number.

It is an amenable number.

91050561 is a deficient number, since it is larger than the sum of its proper divisors (64394751).

91050561 is a wasteful number, since it uses less digits than its factorization.

91050561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160602 (or 160593 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 27.

The square root of 91050561 is about 9542.0417626418. The cubic root of 91050561 is about 449.8774332861.

The spelling of 91050561 in words is "ninety-one million, fifty thousand, five hundred sixty-one".