91581367 has 2 divisors, whose sum is σ = 91581368. Its totient is φ = 91581366.

The previous prime is 91581361. The next prime is 91581433. The reversal of 91581367 is 76318519.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91581367 - 2³ = 91581359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91581361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45790683 + 45790684.

It is an arithmetic number, because the mean of its divisors is an integer number (45790684).

Almost surely, 2^91581367 is an apocalyptic number.

91581367 is a deficient number, since it is larger than the sum of its proper divisors (1).

91581367 is an equidigital number, since it uses as much as digits as its factorization.

91581367 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 40.

The square root of 91581367 is about 9569.8154109680. The cubic root of 91581367 is about 450.7499708021.

The spelling of 91581367 in words is "ninety-one million, five hundred eighty-one thousand, three hundred sixty-seven".