1115523131 has 2 divisors, whose sum is σ = 1115523132. Its totient is φ = 1115523130.

The previous prime is 1115523107. The next prime is 1115523137. The reversal of 1115523131 is 1313255111.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1115523131 is a prime.

It is a super-2 number, since 2×1115523131² = 2488783711592086322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1115523097 and 1115523106.

It is not a weakly prime, because it can be changed into another prime (1115523137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 557761565 + 557761566.

It is an arithmetic number, because the mean of its divisors is an integer number (557761566).

Almost surely, 2^1115523131 is an apocalyptic number.

1115523131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1115523131 is an equidigital number, since it uses as much as digits as its factorization.

1115523131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 450, while the sum is 23.

The square root of 1115523131 is about 33399.4480643019. The cubic root of 1115523131 is about 1037.1132752511.

Adding to 1115523131 its reverse (1313255111), we get a palindrome (2428778242).

The spelling of 1115523131 in words is "one billion, one hundred fifteen million, five hundred twenty-three thousand, one hundred thirty-one".