101197891 has 4 divisors (see below), whose sum is σ = 101219800. Its totient is φ = 101175984.

The previous prime is 101197883. The next prime is 101197903. The reversal of 101197891 is 198791101.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 101197891 - 2³ = 101197883 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 101197891.

It is not an unprimeable number, because it can be changed into a prime (101197801) 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, 1026 + ... + 14263.

It is an arithmetic number, because the mean of its divisors is an integer number (25304950).

Almost surely, 2^101197891 is an apocalyptic number.

101197891 is a deficient number, since it is larger than the sum of its proper divisors (21909).

101197891 is an equidigital number, since it uses as much as digits as its factorization.

101197891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21908.

The product of its (nonzero) digits is 4536, while the sum is 37.

The square root of 101197891 is about 10059.7162484834. The cubic root of 101197891 is about 466.0049042568.

The spelling of 101197891 in words is "one hundred one million, one hundred ninety-seven thousand, eight hundred ninety-one".