91016531 has 2 divisors, whose sum is σ = 91016532. Its totient is φ = 91016530.

The previous prime is 91016507. The next prime is 91016537. The reversal of 91016531 is 13561019.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91016531 - 2¹⁸ = 90754387 is a prime.

It is a super-2 number, since 2×91016531² = 16568017830547922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 91016531.

It is not a weakly prime, because it can be changed into another prime (91016537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45508265 + 45508266.

It is an arithmetic number, because the mean of its divisors is an integer number (45508266).

Almost surely, 2^91016531 is an apocalyptic number.

91016531 is a deficient number, since it is larger than the sum of its proper divisors (1).

91016531 is an equidigital number, since it uses as much as digits as its factorization.

91016531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 91016531 is about 9540.2584346547. The cubic root of 91016531 is about 449.8213793144.

The spelling of 91016531 in words is "ninety-one million, sixteen thousand, five hundred thirty-one".