909091331 has 2 divisors, whose sum is σ = 909091332. Its totient is φ = 909091330.

The previous prime is 909091327. The next prime is 909091349. The reversal of 909091331 is 133190909.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 909091331 - 2² = 909091327 is a prime.

It is a super-2 number, since 2×909091331² = 1652894096198703122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 909091291 and 909091300.

It is not a weakly prime, because it can be changed into another prime (909091321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 454545665 + 454545666.

It is an arithmetic number, because the mean of its divisors is an integer number (454545666).

Almost surely, 2^909091331 is an apocalyptic number.

909091331 is a deficient number, since it is larger than the sum of its proper divisors (1).

909091331 is an equidigital number, since it uses as much as digits as its factorization.

909091331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6561, while the sum is 35.

The square root of 909091331 is about 30151.1414543463. The cubic root of 909091331 is about 968.7294560139.

The spelling of 909091331 in words is "nine hundred nine million, ninety-one thousand, three hundred thirty-one".