91558561 has 8 divisors (see below), whose sum is σ = 95647104. Its totient is φ = 87479040.

The previous prime is 91558543. The next prime is 91558601. The reversal of 91558561 is 16585519.

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 91558561 - 2⁵ = 91558529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91558261) 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, 26356 + ... + 29626.

It is an arithmetic number, because the mean of its divisors is an integer number (11955888).

Almost surely, 2^91558561 is an apocalyptic number.

It is an amenable number.

91558561 is a deficient number, since it is larger than the sum of its proper divisors (4088543).

91558561 is a wasteful number, since it uses less digits than its factorization.

91558561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4511.

The product of its digits is 54000, while the sum is 40.

The square root of 91558561 is about 9568.6237777436. The cubic root of 91558561 is about 450.7125517740.

The spelling of 91558561 in words is "ninety-one million, five hundred fifty-eight thousand, five hundred sixty-one".