91651211 has 2 divisors, whose sum is σ = 91651212. Its totient is φ = 91651210.

The previous prime is 91651187. The next prime is 91651213. The reversal of 91651211 is 11215619.

It is a strong prime.

It is an emirp because it is prime and its reverse (11215619) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91651211 - 2²⁶ = 24542347 is a prime.

Together with 91651213, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91651213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45825605 + 45825606.

It is an arithmetic number, because the mean of its divisors is an integer number (45825606).

Almost surely, 2^91651211 is an apocalyptic number.

91651211 is a deficient number, since it is larger than the sum of its proper divisors (1).

91651211 is an equidigital number, since it uses as much as digits as its factorization.

91651211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 540, while the sum is 26.

The square root of 91651211 is about 9573.4638976705. The cubic root of 91651211 is about 450.8645289710.

The spelling of 91651211 in words is "ninety-one million, six hundred fifty-one thousand, two hundred eleven".