1115531 has 2 divisors, whose sum is σ = 1115532. Its totient is φ = 1115530.

The previous prime is 1115519. The next prime is 1115533. The reversal of 1115531 is 1355111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1115531 - 2⁶ = 1115467 is a prime.

It is a super-2 number, since 2×1115531² = 2488818823922, which contains 22 as substring.

Together with 1115533, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1115533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 557765 + 557766.

It is an arithmetic number, because the mean of its divisors is an integer number (557766).

2^1115531 is an apocalyptic number.

1115531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1115531 is an equidigital number, since it uses as much as digits as its factorization.

1115531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75, while the sum is 17.

The square root of 1115531 is about 1056.1870099561. The cubic root of 1115531 is about 103.7115713875.

The spelling of 1115531 in words is "one million, one hundred fifteen thousand, five hundred thirty-one".