91407791 has 2 divisors, whose sum is σ = 91407792. Its totient is φ = 91407790.

The previous prime is 91407787. The next prime is 91407839. The reversal of 91407791 is 19770419.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91407791 - 2² = 91407787 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91407721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45703895 + 45703896.

It is an arithmetic number, because the mean of its divisors is an integer number (45703896).

Almost surely, 2^91407791 is an apocalyptic number.

91407791 is a deficient number, since it is larger than the sum of its proper divisors (1).

91407791 is an equidigital number, since it uses as much as digits as its factorization.

91407791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876, while the sum is 38.

The square root of 91407791 is about 9560.7421783039. The cubic root of 91407791 is about 450.4650188839.

The spelling of 91407791 in words is "ninety-one million, four hundred seven thousand, seven hundred ninety-one".