91283891 has 2 divisors, whose sum is σ = 91283892. Its totient is φ = 91283890.

The previous prime is 91283873. The next prime is 91283893. The reversal of 91283891 is 19838219.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91283891 - 2⁶ = 91283827 is a prime.

It is a Sophie Germain prime.

Together with 91283893, 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 (91283893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45641945 + 45641946.

It is an arithmetic number, because the mean of its divisors is an integer number (45641946).

Almost surely, 2^91283891 is an apocalyptic number.

91283891 is a deficient number, since it is larger than the sum of its proper divisors (1).

91283891 is an equidigital number, since it uses as much as digits as its factorization.

91283891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 41.

The square root of 91283891 is about 9554.2603586044. The cubic root of 91283891 is about 450.2613971008.

The spelling of 91283891 in words is "ninety-one million, two hundred eighty-three thousand, eight hundred ninety-one".