6406321531 has 16 divisors (see below), whose sum is σ = 7043889600. Its totient is φ = 5799313408.

The previous prime is 6406321529. The next prime is 6406321547. The reversal of 6406321531 is 1351236046.

It is a cyclic number.

It is not a de Polignac number, because 6406321531 - 2¹ = 6406321529 is a prime.

It is a super-2 number, since 2×6406321531² = 82081911117108367922, 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 = 6406321493 and 6406321502.

It is not an unprimeable number, because it can be changed into a prime (6406328531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104955 + ... + 154363.

It is an arithmetic number, because the mean of its divisors is an integer number (440243100).

Almost surely, 2^6406321531 is an apocalyptic number.

6406321531 is a deficient number, since it is larger than the sum of its proper divisors (637568069).

6406321531 is a wasteful number, since it uses less digits than its factorization.

6406321531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49718.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 6406321531 is about 80039.4998172777. The cubic root of 6406321531 is about 1857.2466228674.

Adding to 6406321531 its reverse (1351236046), we get a palindrome (7757557577).

The spelling of 6406321531 in words is "six billion, four hundred six million, three hundred twenty-one thousand, five hundred thirty-one".