531511201531 has 24 divisors (see below), whose sum is σ = 557306728704. Its totient is φ = 506534434560.

The previous prime is 531511201519. The next prime is 531511201541. The reversal of 531511201531 is 135102115135.

It is not a de Polignac number, because 531511201531 - 2¹⁷ = 531511070459 is a prime.

It is a super-2 number, since 2×531511201531² (a number of 24 digits) contains 22 as substring.

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 531511201531.

It is not an unprimeable number, because it can be changed into a prime (531511201511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28716426 + ... + 28734928.

It is an arithmetic number, because the mean of its divisors is an integer number (23221113696).

Almost surely, 2^531511201531 is an apocalyptic number.

531511201531 is a deficient number, since it is larger than the sum of its proper divisors (25795527173).

531511201531 is an equidigital number, since it uses as much as digits as its factorization.

531511201531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18811 (or 18714 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 28.

Adding to 531511201531 its reverse (135102115135), we get a palindrome (666613316666).

The spelling of 531511201531 in words is "five hundred thirty-one billion, five hundred eleven million, two hundred one thousand, five hundred thirty-one".