91000577 has 2 divisors, whose sum is σ = 91000578. Its totient is φ = 91000576.

The previous prime is 91000573. The next prime is 91000583. The reversal of 91000577 is 77500019.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87310336 + 3690241 = 9344^2 + 1921^2 .

It is a cyclic number.

It is not a de Polignac number, because 91000577 - 2² = 91000573 is a prime.

It is a super-2 number, since 2×91000577² = 16562210028665858, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91000573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45500288 + 45500289.

It is an arithmetic number, because the mean of its divisors is an integer number (45500289).

Almost surely, 2^91000577 is an apocalyptic number.

It is an amenable number.

91000577 is a deficient number, since it is larger than the sum of its proper divisors (1).

91000577 is an equidigital number, since it uses as much as digits as its factorization.

91000577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2205, while the sum is 29.

The square root of 91000577 is about 9539.4222571391. The cubic root of 91000577 is about 449.7950951893.

The spelling of 91000577 in words is "ninety-one million, five hundred seventy-seven", and thus it is an aban number.