1531314531 has 32 divisors (see below), whose sum is σ = 2316625920. Its totient is φ = 999359712.

The previous prime is 1531314529. The next prime is 1531314541. The reversal of 1531314531 is 1354131351.

It is a happy number.

It is not a de Polignac number, because 1531314531 - 2¹ = 1531314529 is a prime.

It is a super-2 number, since 2×1531314531² = 4689848385703499922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1531314495 and 1531314504.

It is not an unprimeable number, because it can be changed into a prime (1531314541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 839086 + ... + 840908.

It is an arithmetic number, because the mean of its divisors is an integer number (72394560).

Almost surely, 2^1531314531 is an apocalyptic number.

1531314531 is a deficient number, since it is larger than the sum of its proper divisors (785311389).

1531314531 is a wasteful number, since it uses less digits than its factorization.

1531314531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2472 (or 2466 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The square root of 1531314531 is about 39132.0141444317. The cubic root of 1531314531 is about 1152.6252641376.

Adding to 1531314531 its reverse (1354131351), we get a palindrome (2885445882).

The spelling of 1531314531 in words is "one billion, five hundred thirty-one million, three hundred fourteen thousand, five hundred thirty-one".