91074569 has 2 divisors, whose sum is σ = 91074570. Its totient is φ = 91074568.

The previous prime is 91074551. The next prime is 91074589. The reversal of 91074569 is 96547019.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71182969 + 19891600 = 8437^2 + 4460^2 .

It is a cyclic number.

It is not a de Polignac number, because 91074569 - 2²⁰ = 90025993 is a prime.

It is a super-2 number, since 2×91074569² = 16589154237071522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91074589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45537284 + 45537285.

It is an arithmetic number, because the mean of its divisors is an integer number (45537285).

Almost surely, 2^91074569 is an apocalyptic number.

It is an amenable number.

91074569 is a deficient number, since it is larger than the sum of its proper divisors (1).

91074569 is an equidigital number, since it uses as much as digits as its factorization.

91074569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 91074569 is about 9543.2996914065. The cubic root of 91074569 is about 449.9169706895.

The spelling of 91074569 in words is "ninety-one million, seventy-four thousand, five hundred sixty-nine".