91655401 has 4 divisors (see below), whose sum is σ = 94132612. Its totient is φ = 89178192.

The previous prime is 91655393. The next prime is 91655407. The reversal of 91655401 is 10455619.

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 33362176 + 58293225 = 5776^2 + 7635^2 .

It is a cyclic number.

It is not a de Polignac number, because 91655401 - 2³ = 91655393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91655407) 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, 1238550 + ... + 1238623.

It is an arithmetic number, because the mean of its divisors is an integer number (23533153).

Almost surely, 2^91655401 is an apocalyptic number.

It is an amenable number.

91655401 is a deficient number, since it is larger than the sum of its proper divisors (2477211).

91655401 is a wasteful number, since it uses less digits than its factorization.

91655401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2477210.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 91655401 is about 9573.6827292323. The cubic root of 91655401 is about 450.8713995607.

The spelling of 91655401 in words is "ninety-one million, six hundred fifty-five thousand, four hundred one".