1156591 has 2 divisors, whose sum is σ = 1156592. Its totient is φ = 1156590.

The previous prime is 1156567. The next prime is 1156613. The reversal of 1156591 is 1956511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1156591 - 2⁹ = 1156079 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1156501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578295 + 578296.

It is an arithmetic number, because the mean of its divisors is an integer number (578296).

2^1156591 is an apocalyptic number.

1156591 is a deficient number, since it is larger than the sum of its proper divisors (1).

1156591 is an equidigital number, since it uses as much as digits as its factorization.

1156591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1350, while the sum is 28.

The square root of 1156591 is about 1075.4492084706. The cubic root of 1156591 is about 104.9687284048.

The spelling of 1156591 in words is "one million, one hundred fifty-six thousand, five hundred ninety-one".