1115206531 has 2 divisors, whose sum is σ = 1115206532. Its totient is φ = 1115206530.

The previous prime is 1115206517. The next prime is 1115206541. The reversal of 1115206531 is 1356025111.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1115206531 - 2²⁷ = 980988803 is a prime.

It is a super-2 number, since 2×1115206531² = 2487371213570107922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1115206496 and 1115206505.

It is not a weakly prime, because it can be changed into another prime (1115206541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 557603265 + 557603266.

It is an arithmetic number, because the mean of its divisors is an integer number (557603266).

Almost surely, 2^1115206531 is an apocalyptic number.

1115206531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1115206531 is an equidigital number, since it uses as much as digits as its factorization.

1115206531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 1115206531 is about 33394.7081286841. The cubic root of 1115206531 is about 1037.0151505471.

The spelling of 1115206531 in words is "one billion, one hundred fifteen million, two hundred six thousand, five hundred thirty-one".