291010091 has 2 divisors, whose sum is σ = 291010092. Its totient is φ = 291010090.

The previous prime is 291010073. The next prime is 291010117. The reversal of 291010091 is 190010192.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 291010091 - 2¹⁴ = 290993707 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (291010001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145505045 + 145505046.

It is an arithmetic number, because the mean of its divisors is an integer number (145505046).

Almost surely, 2^291010091 is an apocalyptic number.

291010091 is a deficient number, since it is larger than the sum of its proper divisors (1).

291010091 is an equidigital number, since it uses as much as digits as its factorization.

291010091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 291010091 is about 17059.0178791160. The cubic root of 291010091 is about 662.6781984626.

The spelling of 291010091 in words is "two hundred ninety-one million, ten thousand, ninety-one".