91090907 has 2 divisors, whose sum is σ = 91090908. Its totient is φ = 91090906.

The previous prime is 91090903. The next prime is 91090957. The reversal of 91090907 is 70909019.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (70909019) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91090907 - 2² = 91090903 is a prime.

It is not a weakly prime, because it can be changed into another prime (91090903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45545453 + 45545454.

It is an arithmetic number, because the mean of its divisors is an integer number (45545454).

Almost surely, 2^91090907 is an apocalyptic number.

91090907 is a deficient number, since it is larger than the sum of its proper divisors (1).

91090907 is an equidigital number, since it uses as much as digits as its factorization.

91090907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5103, while the sum is 35.

The square root of 91090907 is about 9544.1556462581. The cubic root of 91090907 is about 449.9438728351.

The spelling of 91090907 in words is "ninety-one million, ninety thousand, nine hundred seven".