91158311 has 2 divisors, whose sum is σ = 91158312. Its totient is φ = 91158310.

The previous prime is 91158307. The next prime is 91158313. The reversal of 91158311 is 11385119.

It is a strong prime.

It is an emirp because it is prime and its reverse (11385119) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91158311 - 2² = 91158307 is a prime.

It is a Sophie Germain prime.

Together with 91158313, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91158313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45579155 + 45579156.

It is an arithmetic number, because the mean of its divisors is an integer number (45579156).

Almost surely, 2^91158311 is an apocalyptic number.

91158311 is a deficient number, since it is larger than the sum of its proper divisors (1).

91158311 is an equidigital number, since it uses as much as digits as its factorization.

91158311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 29.

The square root of 91158311 is about 9547.6861594839. The cubic root of 91158311 is about 450.0548262417.

The spelling of 91158311 in words is "ninety-one million, one hundred fifty-eight thousand, three hundred eleven".