91142563 has 16 divisors (see below), whose sum is σ = 101152800. Its totient is φ = 81768960.

The previous prime is 91142539. The next prime is 91142587. The reversal of 91142563 is 36524119.

It is an interprime number because it is at equal distance from previous prime (91142539) and next prime (91142587).

It is a cyclic number.

It is not a de Polignac number, because 91142563 - 2¹⁷ = 91011491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91140563) 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, 27643 + ... + 30763.

It is an arithmetic number, because the mean of its divisors is an integer number (6322050).

Almost surely, 2^91142563 is an apocalyptic number.

91142563 is a deficient number, since it is larger than the sum of its proper divisors (10010237).

91142563 is a wasteful number, since it uses less digits than its factorization.

91142563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3222.

The product of its digits is 6480, while the sum is 31.

The square root of 91142563 is about 9546.8614214306. The cubic root of 91142563 is about 450.0289084309.

The spelling of 91142563 in words is "ninety-one million, one hundred forty-two thousand, five hundred sixty-three".