91085907 has 8 divisors (see below), whose sum is σ = 132488640. Its totient is φ = 55203560.

The previous prime is 91085903. The next prime is 91085923. The reversal of 91085907 is 70958019.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91085907 - 2² = 91085903 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91085903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1380057 + ... + 1380122.

It is an arithmetic number, because the mean of its divisors is an integer number (16561080).

Almost surely, 2^91085907 is an apocalyptic number.

91085907 is a deficient number, since it is larger than the sum of its proper divisors (41402733).

91085907 is a wasteful number, since it uses less digits than its factorization.

91085907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2760193.

The product of its (nonzero) digits is 22680, while the sum is 39.

The square root of 91085907 is about 9543.8937022580. The cubic root of 91085907 is about 449.9356401783.

The spelling of 91085907 in words is "ninety-one million, eighty-five thousand, nine hundred seven".