1311630531 has 32 divisors (see below), whose sum is σ = 1838453760. Its totient is φ = 830707584.

The previous prime is 1311630521. The next prime is 1311630533. The reversal of 1311630531 is 1350361131.

It is not a de Polignac number, because 1311630531 - 2¹⁹ = 1311106243 is a prime.

It is a super-2 number, since 2×1311630531² = 3440749299702683922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1311630533) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1764946 + ... + 1765688.

It is an arithmetic number, because the mean of its divisors is an integer number (57451680).

Almost surely, 2^1311630531 is an apocalyptic number.

1311630531 is a deficient number, since it is larger than the sum of its proper divisors (526823229).

1311630531 is a wasteful number, since it uses less digits than its factorization.

1311630531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075.

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 1311630531 is about 36216.4400652521. The cubic root of 1311630531 is about 1094.6379629226.

Adding to 1311630531 its reverse (1350361131), we get a palindrome (2661991662).

The spelling of 1311630531 in words is "one billion, three hundred eleven million, six hundred thirty thousand, five hundred thirty-one".