64122191 has 4 divisors (see below), whose sum is σ = 73282512. Its totient is φ = 54961872.

The previous prime is 64122187. The next prime is 64122197. The reversal of 64122191 is 19122146.

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

It is not a de Polignac number, because 64122191 - 2² = 64122187 is a prime.

It is a super-2 number, since 2×64122191² = 8223310757280962, which contains 22 as substring.

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 64122191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64122197) 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, 4580150 + ... + 4580163.

It is an arithmetic number, because the mean of its divisors is an integer number (18320628).

Almost surely, 2^64122191 is an apocalyptic number.

64122191 is a deficient number, since it is larger than the sum of its proper divisors (9160321).

64122191 is an equidigital number, since it uses as much as digits as its factorization.

64122191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9160320.

The product of its digits is 864, while the sum is 26.

The square root of 64122191 is about 8007.6332957997. The cubic root of 64122191 is about 400.2544027471.

The spelling of 64122191 in words is "sixty-four million, one hundred twenty-two thousand, one hundred ninety-one".