1331540531 has 8 divisors (see below), whose sum is σ = 1348401600. Its totient is φ = 1314699112.

The previous prime is 1331540471. The next prime is 1331540543. The reversal of 1331540531 is 1350451331.

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

It is a cyclic number.

It is not a de Polignac number, because 1331540531 - 2²⁶ = 1264431667 is a prime.

It is a super-2 number, since 2×1331540531² = 3546000371391523922, which 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 1331540531.

It is not an unprimeable number, because it can be changed into a prime (1331540131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170396 + ... + 178038.

It is an arithmetic number, because the mean of its divisors is an integer number (168550200).

Almost surely, 2^1331540531 is an apocalyptic number.

1331540531 is a deficient number, since it is larger than the sum of its proper divisors (16861069).

1331540531 is an equidigital number, since it uses as much as digits as its factorization.

1331540531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9825.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 1331540531 is about 36490.2799523380. The cubic root of 1331540531 is about 1100.1488864587.

Adding to 1331540531 its reverse (1350451331), we get a palindrome (2681991862).

The spelling of 1331540531 in words is "one billion, three hundred thirty-one million, five hundred forty thousand, five hundred thirty-one".