91141591 has 2 divisors, whose sum is σ = 91141592. Its totient is φ = 91141590.

The previous prime is 91141559. The next prime is 91141597. The reversal of 91141591 is 19514119.

It is a strong prime.

It is an emirp because it is prime and its reverse (19514119) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91141591 - 2⁵ = 91141559 is a prime.

It is a super-2 number, since 2×91141591² = 16613579220022562, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91141597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45570795 + 45570796.

It is an arithmetic number, because the mean of its divisors is an integer number (45570796).

Almost surely, 2^91141591 is an apocalyptic number.

91141591 is a deficient number, since it is larger than the sum of its proper divisors (1).

91141591 is an equidigital number, since it uses as much as digits as its factorization.

91141591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1620, while the sum is 31.

The square root of 91141591 is about 9546.8105145122. The cubic root of 91141591 is about 450.0273086308.

The spelling of 91141591 in words is "ninety-one million, one hundred forty-one thousand, five hundred ninety-one".