64240531 has 4 divisors (see below), whose sum is σ = 64328200. Its totient is φ = 64152864.

The previous prime is 64240529. The next prime is 64240549. The reversal of 64240531 is 13504246.

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 64240531 - 2¹ = 64240529 is a prime.

It is a super-2 number, since 2×64240531² = 8253691646323922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64240496 and 64240505.

It is not an unprimeable number, because it can be changed into a prime (64240031) 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, 42726 + ... + 44203.

It is an arithmetic number, because the mean of its divisors is an integer number (16082050).

Almost surely, 2^64240531 is an apocalyptic number.

64240531 is a deficient number, since it is larger than the sum of its proper divisors (87669).

64240531 is an equidigital number, since it uses as much as digits as its factorization.

64240531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87668.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 64240531 is about 8015.0190891850. The cubic root of 64240531 is about 400.5004797888.

Adding to 64240531 its reverse (13504246), we get a palindrome (77744777).

The spelling of 64240531 in words is "sixty-four million, two hundred forty thousand, five hundred thirty-one".