1156597891 has 2 divisors, whose sum is σ = 1156597892. Its totient is φ = 1156597890.

The previous prime is 1156597861. The next prime is 1156597903. The reversal of 1156597891 is 1987956511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1156597891 - 2⁵ = 1156597859 is a prime.

It is not a weakly prime, because it can be changed into another prime (1156597861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578298945 + 578298946.

It is an arithmetic number, because the mean of its divisors is an integer number (578298946).

Almost surely, 2^1156597891 is an apocalyptic number.

1156597891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1156597891 is an equidigital number, since it uses as much as digits as its factorization.

1156597891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 680400, while the sum is 52.

The square root of 1156597891 is about 34008.7913781128. The cubic root of 1156597891 is about 1049.6893687319.

The spelling of 1156597891 in words is "one billion, one hundred fifty-six million, five hundred ninety-seven thousand, eight hundred ninety-one".