1155971 has 2 divisors, whose sum is σ = 1155972. Its totient is φ = 1155970.

The previous prime is 1155967. The next prime is 1155977. The reversal of 1155971 is 1795511.

It is a weak prime.

It is an emirp because it is prime and its reverse (1795511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1155971 - 2² = 1155967 is a prime.

It is not a weakly prime, because it can be changed into another prime (1155977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577985 + 577986.

It is an arithmetic number, because the mean of its divisors is an integer number (577986).

2^1155971 is an apocalyptic number.

1155971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155971 is an equidigital number, since it uses as much as digits as its factorization.

1155971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1575, while the sum is 29.

The square root of 1155971 is about 1075.1609181885. The cubic root of 1155971 is about 104.9499686058.

The spelling of 1155971 in words is "one million, one hundred fifty-five thousand, nine hundred seventy-one".