1311532551 has 96 divisors (see below), whose sum is σ = 2367805440. Its totient is φ = 682903872.

The previous prime is 1311532517. The next prime is 1311532567. The reversal of 1311532551 is 1552351131.

It is not a de Polignac number, because 1311532551 - 2¹⁷ = 1311401479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311532501) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4271940 + ... + 4272246.

It is an arithmetic number, because the mean of its divisors is an integer number (24664640).

Almost surely, 2^1311532551 is an apocalyptic number.

1311532551 is a deficient number, since it is larger than the sum of its proper divisors (1056272889).

1311532551 is a wasteful number, since it uses less digits than its factorization.

1311532551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465 (or 462 counting only the distinct ones).

The product of its digits is 2250, while the sum is 27.

The square root of 1311532551 is about 36215.0873393949. The cubic root of 1311532551 is about 1094.6107054249.

Adding to 1311532551 its reverse (1552351131), we get a palindrome (2863883682).

The spelling of 1311532551 in words is "one billion, three hundred eleven million, five hundred thirty-two thousand, five hundred fifty-one".