91921101 has 4 divisors (see below), whose sum is σ = 122561472. Its totient is φ = 61280732.

The previous prime is 91921051. The next prime is 91921103. The reversal of 91921101 is 10112919.

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: 10112919 = 3 ⋅3370973.

It is a cyclic number.

It is not a de Polignac number, because 91921101 - 2⁷ = 91920973 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91921103) 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, 15320181 + ... + 15320186.

It is an arithmetic number, because the mean of its divisors is an integer number (30640368).

Almost surely, 2^91921101 is an apocalyptic number.

It is an amenable number.

91921101 is a deficient number, since it is larger than the sum of its proper divisors (30640371).

91921101 is a wasteful number, since it uses less digits than its factorization.

91921101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30640370.

The product of its (nonzero) digits is 162, while the sum is 24.

The square root of 91921101 is about 9587.5492697561. The cubic root of 91921101 is about 451.3066565347.

The spelling of 91921101 in words is "ninety-one million, nine hundred twenty-one thousand, one hundred one".