64109197 has 4 divisors (see below), whose sum is σ = 65841916. Its totient is φ = 62376480.

The previous prime is 64109191. The next prime is 64109203. The reversal of 64109197 is 79190146.

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

It is an interprime number because it is at equal distance from previous prime (64109191) and next prime (64109203).

It can be written as a sum of positive squares in 2 ways, for example, as 44342281 + 19766916 = 6659^2 + 4446^2 .

It is a cyclic number.

It is not a de Polignac number, because 64109197 - 2³ = 64109189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 1732681 = 64109197 / (6 + 4 + 1 + 0 + 9 + 1 + 9 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64109191) 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, 866304 + ... + 866377.

It is an arithmetic number, because the mean of its divisors is an integer number (16460479).

Almost surely, 2^64109197 is an apocalyptic number.

It is an amenable number.

64109197 is a deficient number, since it is larger than the sum of its proper divisors (1732719).

64109197 is a wasteful number, since it uses less digits than its factorization.

64109197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1732718.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 64109197 is about 8006.8219038517. The cubic root of 64109197 is about 400.2273644890.

The spelling of 64109197 in words is "sixty-four million, one hundred nine thousand, one hundred ninety-seven".