64495531 has 4 divisors (see below), whose sum is σ = 66576064. Its totient is φ = 62415000.

The previous prime is 64495513. The next prime is 64495537. The reversal of 64495531 is 13559446.

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 64495531 - 2¹¹ = 64493483 is a prime.

It is a super-2 number, since 2×64495531² = 8319347037943922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64495537) 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, 1040220 + ... + 1040281.

It is an arithmetic number, because the mean of its divisors is an integer number (16644016).

Almost surely, 2^64495531 is an apocalyptic number.

64495531 is a deficient number, since it is larger than the sum of its proper divisors (2080533).

64495531 is a wasteful number, since it uses less digits than its factorization.

64495531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2080532.

The product of its digits is 64800, while the sum is 37.

The square root of 64495531 is about 8030.9109694978. The cubic root of 64495531 is about 401.0297032535.

The spelling of 64495531 in words is "sixty-four million, four hundred ninety-five thousand, five hundred thirty-one".