1156540331 has 2 divisors, whose sum is σ = 1156540332. Its totient is φ = 1156540330.

The previous prime is 1156540313. The next prime is 1156540373. The reversal of 1156540331 is 1330456511.

Together with previous prime (1156540313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1156540331 - 2⁶ = 1156540267 is a prime.

It is a super-2 number, since 2×1156540331² = 2675171074459179122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1156540294 and 1156540303.

It is not a weakly prime, because it can be changed into another prime (1156540381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578270165 + 578270166.

It is an arithmetic number, because the mean of its divisors is an integer number (578270166).

Almost surely, 2^1156540331 is an apocalyptic number.

1156540331 is a deficient number, since it is larger than the sum of its proper divisors (1).

1156540331 is an equidigital number, since it uses as much as digits as its factorization.

1156540331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 1156540331 is about 34007.9451158108. The cubic root of 1156540331 is about 1049.6719552693.

Adding to 1156540331 its reverse (1330456511), we get a palindrome (2486996842).

The spelling of 1156540331 in words is "one billion, one hundred fifty-six million, five hundred forty thousand, three hundred thirty-one".