91659121 has 4 divisors (see below), whose sum is σ = 97050852. Its totient is φ = 86267392.

The previous prime is 91659107. The next prime is 91659133. The reversal of 91659121 is 12195619.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33350625 + 58308496 = 5775^2 + 7636^2 .

It is a cyclic number.

It is not a de Polignac number, because 91659121 - 2¹¹ = 91657073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91659151) 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, 2695840 + ... + 2695873.

It is an arithmetic number, because the mean of its divisors is an integer number (24262713).

Almost surely, 2^91659121 is an apocalyptic number.

It is an amenable number.

91659121 is a deficient number, since it is larger than the sum of its proper divisors (5391731).

91659121 is a wasteful number, since it uses less digits than its factorization.

91659121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5391730.

The product of its digits is 4860, while the sum is 34.

The square root of 91659121 is about 9573.8770098639. The cubic root of 91659121 is about 450.8774992882.

The spelling of 91659121 in words is "ninety-one million, six hundred fifty-nine thousand, one hundred twenty-one".