91659601 has 4 divisors (see below), whose sum is σ = 99992304. Its totient is φ = 83326900.

The previous prime is 91659593. The next prime is 91659683. The reversal of 91659601 is 10695619.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10695619 = 11 ⋅972329.

It is a cyclic number.

It is not a de Polignac number, because 91659601 - 2³ = 91659593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91654601) 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, 4166335 + ... + 4166356.

It is an arithmetic number, because the mean of its divisors is an integer number (24998076).

Almost surely, 2^91659601 is an apocalyptic number.

It is an amenable number.

91659601 is a deficient number, since it is larger than the sum of its proper divisors (8332703).

91659601 is a wasteful number, since it uses less digits than its factorization.

91659601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8332702.

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 91659601 is about 9573.9020780453. The cubic root of 91659601 is about 450.8782863378.

The spelling of 91659601 in words is "ninety-one million, six hundred fifty-nine thousand, six hundred one".