91657667 has 4 divisors (see below), whose sum is σ = 91687800. Its totient is φ = 91627536.

The previous prime is 91657633. The next prime is 91657679. The reversal of 91657667 is 76675619.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76675619 = 193 ⋅397283.

It is a cyclic number.

It is not a de Polignac number, because 91657667 - 2⁸ = 91657411 is a prime.

It is a super-2 number, since 2×91657667² = 16802255839765778, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91657627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9917 + ... + 16782.

It is an arithmetic number, because the mean of its divisors is an integer number (22921950).

Almost surely, 2^91657667 is an apocalyptic number.

91657667 is a deficient number, since it is larger than the sum of its proper divisors (30133).

91657667 is a wasteful number, since it uses less digits than its factorization.

91657667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30132.

The product of its digits is 476280, while the sum is 47.

The square root of 91657667 is about 9573.8010737638. The cubic root of 91657667 is about 450.8751151670.

The spelling of 91657667 in words is "ninety-one million, six hundred fifty-seven thousand, six hundred sixty-seven".