91117651 has 8 divisors (see below), whose sum is σ = 96383520. Its totient is φ = 85960512.

The previous prime is 91117633. The next prime is 91117667. The reversal of 91117651 is 15671119.

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 91117651 - 2¹⁵ = 91084883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91111651) 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, 25456 + ... + 28813.

It is an arithmetic number, because the mean of its divisors is an integer number (12047940).

Almost surely, 2^91117651 is an apocalyptic number.

91117651 is a deficient number, since it is larger than the sum of its proper divisors (5265869).

91117651 is a wasteful number, since it uses less digits than its factorization.

91117651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54365.

The product of its digits is 1890, while the sum is 31.

The square root of 91117651 is about 9545.5566102768. The cubic root of 91117651 is about 449.9879025554.

The spelling of 91117651 in words is "ninety-one million, one hundred seventeen thousand, six hundred fifty-one".