1131575531 has 2 divisors, whose sum is σ = 1131575532. Its totient is φ = 1131575530.

The previous prime is 1131575521. The next prime is 1131575537. The reversal of 1131575531 is 1355751311.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1131575531 - 2¹⁸ = 1131313387 is a prime.

It is a super-2 number, since 2×1131575531² = 2560926364715863922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1131575537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565787765 + 565787766.

It is an arithmetic number, because the mean of its divisors is an integer number (565787766).

Almost surely, 2^1131575531 is an apocalyptic number.

1131575531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131575531 is an equidigital number, since it uses as much as digits as its factorization.

1131575531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7875, while the sum is 32.

The square root of 1131575531 is about 33638.8990753265. The cubic root of 1131575531 is about 1042.0642957638.

The spelling of 1131575531 in words is "one billion, one hundred thirty-one million, five hundred seventy-five thousand, five hundred thirty-one".