1155919 has 2 divisors, whose sum is σ = 1155920. Its totient is φ = 1155918.

The previous prime is 1155907. The next prime is 1155923. The reversal of 1155919 is 9195511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1155919 - 2¹¹ = 1153871 is a prime.

It is a super-2 number, since 2×1155919² = 2672297469122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1155929) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577959 + 577960.

It is an arithmetic number, because the mean of its divisors is an integer number (577960).

2^1155919 is an apocalyptic number.

1155919 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155919 is an equidigital number, since it uses as much as digits as its factorization.

1155919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2025, while the sum is 31.

The square root of 1155919 is about 1075.1367354900. The cubic root of 1155919 is about 104.9483948984.

It can be divided in two parts, 115591 and 9, that added together give a square (115600 = 340²).

The spelling of 1155919 in words is "one million, one hundred fifty-five thousand, nine hundred nineteen".