1155961 has 2 divisors, whose sum is σ = 1155962. Its totient is φ = 1155960.

The previous prime is 1155953. The next prime is 1155967. The reversal of 1155961 is 1695511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 962361 + 193600 = 981^2 + 440^2 .

It is an emirp because it is prime and its reverse (1695511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1155961 - 2³ = 1155953 is a prime.

It is a Chen prime.

It is a pancake number, because a pancake can be divided into 1155961 parts by 1520 straight cuts.

It is not a weakly prime, because it can be changed into another prime (1155967) 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, 577980 + 577981.

It is an arithmetic number, because the mean of its divisors is an integer number (577981).

2^1155961 is an apocalyptic number.

It is an amenable number.

1155961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155961 is an equidigital number, since it uses as much as digits as its factorization.

1155961 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 1155961 is about 1075.1562677118. The cubic root of 1155961 is about 104.9496659734.

It can be divided in two parts, 1155 and 961, that added together give a square (2116 = 46²).

The spelling of 1155961 in words is "one million, one hundred fifty-five thousand, nine hundred sixty-one".