531157397 has 2 divisors, whose sum is σ = 531157398. Its totient is φ = 531157396.

The previous prime is 531157381. The next prime is 531157427. The reversal of 531157397 is 793751135.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 443060401 + 88096996 = 21049^2 + 9386^2 .

It is a cyclic number.

It is not a de Polignac number, because 531157397 - 2⁴ = 531157381 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531157897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265578698 + 265578699.

It is an arithmetic number, because the mean of its divisors is an integer number (265578699).

Almost surely, 2^531157397 is an apocalyptic number.

It is an amenable number.

531157397 is a deficient number, since it is larger than the sum of its proper divisors (1).

531157397 is an equidigital number, since it uses as much as digits as its factorization.

531157397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 99225, while the sum is 41.

The square root of 531157397 is about 23046.8522145650. The cubic root of 531157397 is about 809.8558891108.

The spelling of 531157397 in words is "five hundred thirty-one million, one hundred fifty-seven thousand, three hundred ninety-seven".