64171969 has 4 divisors (see below), whose sum is σ = 64202544. Its totient is φ = 64141396.

The previous prime is 64171927. The next prime is 64171993. The reversal of 64171969 is 96917146.

It is a happy number.

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 64171969 - 2⁷ = 64171841 is a prime.

It is a super-2 number, since 2×64171969² = 8236083210673922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64171069) 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, 11887 + ... + 16420.

It is an arithmetic number, because the mean of its divisors is an integer number (16050636).

Almost surely, 2^64171969 is an apocalyptic number.

It is an amenable number.

64171969 is a deficient number, since it is larger than the sum of its proper divisors (30575).

64171969 is a wasteful number, since it uses less digits than its factorization.

64171969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30574.

The product of its digits is 81648, while the sum is 43.

The square root of 64171969 is about 8010.7408521310. The cubic root of 64171969 is about 400.3579483369.

The spelling of 64171969 in words is "sixty-four million, one hundred seventy-one thousand, nine hundred sixty-nine".