561346531 has 4 divisors (see below), whose sum is σ = 561517792. Its totient is φ = 561175272.

The previous prime is 561346529. The next prime is 561346547. The reversal of 561346531 is 135643165.

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 561346531 - 2¹ = 561346529 is a prime.

It is a super-2 number, since 2×561346531² = 630219855731467922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561346501) 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, 80616 + ... + 87301.

It is an arithmetic number, because the mean of its divisors is an integer number (140379448).

Almost surely, 2^561346531 is an apocalyptic number.

561346531 is a deficient number, since it is larger than the sum of its proper divisors (171261).

561346531 is a wasteful number, since it uses less digits than its factorization.

561346531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171260.

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

The square root of 561346531 is about 23692.7527104809. The cubic root of 561346531 is about 824.9171785852.

Adding to 561346531 its reverse (135643165), we get a palindrome (696989696).

The spelling of 561346531 in words is "five hundred sixty-one million, three hundred forty-six thousand, five hundred thirty-one".