531573121 has 4 divisors (see below), whose sum is σ = 534645972. Its totient is φ = 528500272.

The previous prime is 531573101. The next prime is 531573137. The reversal of 531573121 is 121375135.

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

It can be written as a sum of positive squares in 2 ways, for example, as 293642496 + 237930625 = 17136^2 + 15425^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-531573121 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 531573121.

It is not an unprimeable number, because it can be changed into a prime (531573101) 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, 1536166 + ... + 1536511.

It is an arithmetic number, because the mean of its divisors is an integer number (133661493).

Almost surely, 2^531573121 is an apocalyptic number.

It is an amenable number.

531573121 is a deficient number, since it is larger than the sum of its proper divisors (3072851).

531573121 is a wasteful number, since it uses less digits than its factorization.

531573121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3072850.

The product of its digits is 3150, while the sum is 28.

The square root of 531573121 is about 23055.8695563624. The cubic root of 531573121 is about 810.0671188603.

The spelling of 531573121 in words is "five hundred thirty-one million, five hundred seventy-three thousand, one hundred twenty-one".