91401691 has 2 divisors, whose sum is σ = 91401692. Its totient is φ = 91401690.

The previous prime is 91401641. The next prime is 91401719. The reversal of 91401691 is 19610419.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91401691 - 2¹¹ = 91399643 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91401641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45700845 + 45700846.

It is an arithmetic number, because the mean of its divisors is an integer number (45700846).

Almost surely, 2^91401691 is an apocalyptic number.

91401691 is a deficient number, since it is larger than the sum of its proper divisors (1).

91401691 is an equidigital number, since it uses as much as digits as its factorization.

91401691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 91401691 is about 9560.4231600908. The cubic root of 91401691 is about 450.4549982292.

The spelling of 91401691 in words is "ninety-one million, four hundred one thousand, six hundred ninety-one".