531872393 has 8 divisors (see below), whose sum is σ = 572997768. Its totient is φ = 490777344.

The previous prime is 531872347. The next prime is 531872417. The reversal of 531872393 is 393278135.

It can be written as a sum of positive squares in 4 ways, for example, as 159845449 + 372026944 = 12643^2 + 19288^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 531872393 - 2⁸ = 531872137 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 531872393.

It is not an unprimeable number, because it can be changed into a prime (531872893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39905 + ... + 51537.

It is an arithmetic number, because the mean of its divisors is an integer number (71624721).

Almost surely, 2^531872393 is an apocalyptic number.

It is an amenable number.

531872393 is a deficient number, since it is larger than the sum of its proper divisors (41125375).

531872393 is a wasteful number, since it uses less digits than its factorization.

531872393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15163.

The product of its digits is 136080, while the sum is 41.

The square root of 531872393 is about 23062.3587908956. The cubic root of 531872393 is about 810.2191110735.

The spelling of 531872393 in words is "five hundred thirty-one million, eight hundred seventy-two thousand, three hundred ninety-three".