64195531 has 8 divisors (see below), whose sum is σ = 66502800. Its totient is φ = 61894560.

The previous prime is 64195529. The next prime is 64195541. The reversal of 64195531 is 13559146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64195531 - 2¹ = 64195529 is a prime.

It is a super-2 number, since 2×64195531² = 8242132400743922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64195511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30625 + ... + 32653.

It is an arithmetic number, because the mean of its divisors is an integer number (8312850).

Almost surely, 2^64195531 is an apocalyptic number.

64195531 is a deficient number, since it is larger than the sum of its proper divisors (2307269).

64195531 is a wasteful number, since it uses less digits than its factorization.

64195531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3149.

The product of its digits is 16200, while the sum is 34.

The square root of 64195531 is about 8012.2113676562. The cubic root of 64195531 is about 400.4069421049.

The spelling of 64195531 in words is "sixty-four million, one hundred ninety-five thousand, five hundred thirty-one".