531161321 has 6 divisors (see below), whose sum is σ = 560588922. Its totient is φ = 503205120.

The previous prime is 531161317. The next prime is 531161329. The reversal of 531161321 is 123161135.

It can be written as a sum of positive squares in only one way, i.e., 502656400 + 28504921 = 22420^2 + 5339^2 .

It is not a de Polignac number, because 531161321 - 2² = 531161317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (531161329) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 735320 + ... + 736041.

It is an arithmetic number, because the mean of its divisors is an integer number (93431487).

Almost surely, 2^531161321 is an apocalyptic number.

It is an amenable number.

531161321 is a deficient number, since it is larger than the sum of its proper divisors (29427601).

531161321 is a wasteful number, since it uses less digits than its factorization.

531161321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1471399 (or 1471380 counting only the distinct ones).

The product of its digits is 540, while the sum is 23.

The square root of 531161321 is about 23046.9373453394. The cubic root of 531161321 is about 809.8578834140.

The spelling of 531161321 in words is "five hundred thirty-one million, one hundred sixty-one thousand, three hundred twenty-one".