91623220201 has 4 divisors (see below), whose sum is σ = 91657170000. Its totient is φ = 91589270404.

The previous prime is 91623220189. The next prime is 91623220229. The reversal of 91623220201 is 10202232619.

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.

It is a cyclic number.

It is not a de Polignac number, because 91623220201 - 2¹⁵ = 91623187433 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 91623220201.

It is not an unprimeable number, because it can be changed into a prime (91623220291) 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, 16970851 + ... + 16976248.

It is an arithmetic number, because the mean of its divisors is an integer number (22914292500).

Almost surely, 2^91623220201 is an apocalyptic number.

It is an amenable number.

91623220201 is a deficient number, since it is larger than the sum of its proper divisors (33949799).

91623220201 is a wasteful number, since it uses less digits than its factorization.

91623220201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33949798.

The product of its (nonzero) digits is 2592, while the sum is 28.

The spelling of 91623220201 in words is "ninety-one billion, six hundred twenty-three million, two hundred twenty thousand, two hundred one".