91555201 has 4 divisors (see below), whose sum is σ = 93503232. Its totient is φ = 89607172.

The previous prime is 91555181. The next prime is 91555223. The reversal of 91555201 is 10255519.

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: 10255519 = 97 ⋅105727.

It is a cyclic number.

It is not a de Polignac number, because 91555201 - 2⁵ = 91555169 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91555201.

It is not an unprimeable number, because it can be changed into a prime (91555241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 973945 + ... + 974038.

It is an arithmetic number, because the mean of its divisors is an integer number (23375808).

Almost surely, 2^91555201 is an apocalyptic number.

It is an amenable number.

91555201 is a deficient number, since it is larger than the sum of its proper divisors (1948031).

91555201 is a wasteful number, since it uses less digits than its factorization.

91555201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1948030.

The product of its (nonzero) digits is 2250, while the sum is 28.

The square root of 91555201 is about 9568.4482022949. The cubic root of 91555201 is about 450.7070383165.

The spelling of 91555201 in words is "ninety-one million, five hundred fifty-five thousand, two hundred one".