3640318531 has 4 divisors (see below), whose sum is σ = 3643320832. Its totient is φ = 3637316232.

The previous prime is 3640318523. The next prime is 3640318543. The reversal of 3640318531 is 1358130463.

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 3640318531 - 2³ = 3640318523 is a prime.

It is a super-2 number, since 2×3640318531² = 26503838014283995922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3640318631) 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, 1499331 + ... + 1501756.

It is an arithmetic number, because the mean of its divisors is an integer number (910830208).

Almost surely, 2^3640318531 is an apocalyptic number.

3640318531 is a deficient number, since it is larger than the sum of its proper divisors (3002301).

3640318531 is a wasteful number, since it uses less digits than its factorization.

3640318531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3002300.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 3640318531 is about 60335.0522582023. The cubic root of 3640318531 is about 1538.3192055891.

Adding to 3640318531 its reverse (1358130463), we get a palindrome (4998448994).

The spelling of 3640318531 in words is "three billion, six hundred forty million, three hundred eighteen thousand, five hundred thirty-one".