531142393 has 2 divisors, whose sum is σ = 531142394. Its totient is φ = 531142392.

The previous prime is 531142327. The next prime is 531142399. The reversal of 531142393 is 393241135.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 386830224 + 144312169 = 19668^2 + 12013^2 .

It is a cyclic number.

It is not a de Polignac number, because 531142393 - 2⁹ = 531141881 is a prime.

It is a super-2 number, since 2×531142393² = 564224483283532898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (531142399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265571196 + 265571197.

It is an arithmetic number, because the mean of its divisors is an integer number (265571197).

Almost surely, 2^531142393 is an apocalyptic number.

It is an amenable number.

531142393 is a deficient number, since it is larger than the sum of its proper divisors (1).

531142393 is an equidigital number, since it uses as much as digits as its factorization.

531142393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 31.

The square root of 531142393 is about 23046.5267014359. The cubic root of 531142393 is about 809.8482635042.

The spelling of 531142393 in words is "five hundred thirty-one million, one hundred forty-two thousand, three hundred ninety-three".