6561430531 has 16 divisors (see below), whose sum is σ = 7080192000. Its totient is φ = 6060225600.

The previous prime is 6561430471. The next prime is 6561430553. The reversal of 6561430531 is 1350341656.

It is a cyclic number.

It is not a de Polignac number, because 6561430531 - 2¹¹ = 6561428483 is a prime.

It is a super-2 number, since 2×6561430531² = 86104741226277883922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6561430231) 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, 1867066 + ... + 1870576.

It is an arithmetic number, because the mean of its divisors is an integer number (442512000).

Almost surely, 2^6561430531 is an apocalyptic number.

6561430531 is a deficient number, since it is larger than the sum of its proper divisors (518761469).

6561430531 is a wasteful number, since it uses less digits than its factorization.

6561430531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5970.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 6561430531 is about 81002.6575551691. The cubic root of 6561430531 is about 1872.1163882081.

The spelling of 6561430531 in words is "six billion, five hundred sixty-one million, four hundred thirty thousand, five hundred thirty-one".