1065311531 has 4 divisors (see below), whose sum is σ = 1067622864. Its totient is φ = 1063000200.

The previous prime is 1065311509. The next prime is 1065311563. The reversal of 1065311531 is 1351135601.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1065311531 is a prime.

It is a super-2 number, since 2×1065311531² = 2269777316163127922, 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 1065311531.

It is not an unprimeable number, because it can be changed into a prime (1065311231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1154975 + ... + 1155896.

It is an arithmetic number, because the mean of its divisors is an integer number (266905716).

Almost surely, 2^1065311531 is an apocalyptic number.

1065311531 is a deficient number, since it is larger than the sum of its proper divisors (2311333).

1065311531 is an equidigital number, since it uses as much as digits as its factorization.

1065311531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2311332.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 1065311531 is about 32639.1104505009. The cubic root of 1065311531 is about 1021.3130376421.

The spelling of 1065311531 in words is "one billion, sixty-five million, three hundred eleven thousand, five hundred thirty-one".