1155901 has 2 divisors, whose sum is σ = 1155902. Its totient is φ = 1155900.

The previous prime is 1155899. The next prime is 1155907. The reversal of 1155901 is 1095511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 931225 + 224676 = 965^2 + 474^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155901 - 2¹ = 1155899 is a prime.

It is a super-2 number, since 2×1155901² = 2672214243602, which contains 22 as substring.

Together with 1155899, it forms a pair of twin primes.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1155907) 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, 577950 + 577951.

It is an arithmetic number, because the mean of its divisors is an integer number (577951).

2^1155901 is an apocalyptic number.

It is an amenable number.

1155901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155901 is an equidigital number, since it uses as much as digits as its factorization.

1155901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225, while the sum is 22.

The square root of 1155901 is about 1075.1283644291. The cubic root of 1155901 is about 104.9478501426.

The spelling of 1155901 in words is "one million, one hundred fifty-five thousand, nine hundred one".