531040397 has 2 divisors, whose sum is σ = 531040398. Its totient is φ = 531040396.

The previous prime is 531040387. The next prime is 531040403. The reversal of 531040397 is 793040135.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 432057796 + 98982601 = 20786^2 + 9949^2 .

It is a cyclic number.

It is not a de Polignac number, because 531040397 - 2¹⁸ = 530778253 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 (531040327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265520198 + 265520199.

It is an arithmetic number, because the mean of its divisors is an integer number (265520199).

Almost surely, 2^531040397 is an apocalyptic number.

It is an amenable number.

531040397 is a deficient number, since it is larger than the sum of its proper divisors (1).

531040397 is an equidigital number, since it uses as much as digits as its factorization.

531040397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 531040397 is about 23044.3137671748. The cubic root of 531040397 is about 809.7964214291.

The spelling of 531040397 in words is "five hundred thirty-one million, forty thousand, three hundred ninety-seven".