531161643 has 4 divisors (see below), whose sum is σ = 708215528. Its totient is φ = 354107760.

The previous prime is 531161633. The next prime is 531161723. The reversal of 531161643 is 346161135.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 531161643 - 2⁵ = 531161611 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 531161643.

It is not an unprimeable number, because it can be changed into a prime (531161623) 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, 88526938 + ... + 88526943.

It is an arithmetic number, because the mean of its divisors is an integer number (177053882).

Almost surely, 2^531161643 is an apocalyptic number.

531161643 is a deficient number, since it is larger than the sum of its proper divisors (177053885).

531161643 is a wasteful number, since it uses less digits than its factorization.

531161643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177053884.

The product of its digits is 6480, while the sum is 30.

The square root of 531161643 is about 23046.9443310822. The cubic root of 531161643 is about 809.8580470644.

The spelling of 531161643 in words is "five hundred thirty-one million, one hundred sixty-one thousand, six hundred forty-three".