531397157 has 8 divisors (see below), whose sum is σ = 539570880. Its totient is φ = 523242720.

The previous prime is 531397151. The next prime is 531397199. The reversal of 531397157 is 751793135.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-531397157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531397151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56633 + ... + 65345.

It is an arithmetic number, because the mean of its divisors is an integer number (67446360).

Almost surely, 2^531397157 is an apocalyptic number.

It is an amenable number.

531397157 is a deficient number, since it is larger than the sum of its proper divisors (8173723).

531397157 is an equidigital number, since it uses as much as digits as its factorization.

531397157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9643.

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

The square root of 531397157 is about 23052.0532057342. The cubic root of 531397157 is about 809.9777248358.

The spelling of 531397157 in words is "five hundred thirty-one million, three hundred ninety-seven thousand, one hundred fifty-seven".