1131015531 has 16 divisors (see below), whose sum is σ = 1523032704. Its totient is φ = 746519424.

The previous prime is 1131015511. The next prime is 1131015551. The reversal of 1131015531 is 1355101311.

It is an interprime number because it is at equal distance from previous prime (1131015511) and next prime (1131015551).

It is not a de Polignac number, because 1131015531 - 2¹⁷ = 1130884459 is a prime.

It is a super-2 number, since 2×1131015531² = 2558392262726423922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1131015498 and 1131015507.

It is not an unprimeable number, because it can be changed into a prime (1131015511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 604860 + ... + 606726.

It is an arithmetic number, because the mean of its divisors is an integer number (95189544).

Almost surely, 2^1131015531 is an apocalyptic number.

1131015531 is a deficient number, since it is larger than the sum of its proper divisors (392017173).

1131015531 is a wasteful number, since it uses less digits than its factorization.

1131015531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3770.

The product of its (nonzero) digits is 225, while the sum is 21.

The square root of 1131015531 is about 33630.5743483515. The cubic root of 1131015531 is about 1041.8923666612.

Adding to 1131015531 its reverse (1355101311), we get a palindrome (2486116842).

The spelling of 1131015531 in words is "one billion, one hundred thirty-one million, fifteen thousand, five hundred thirty-one".