1151861 has 2 divisors, whose sum is σ = 1151862. Its totient is φ = 1151860.

The previous prime is 1151807. The next prime is 1151873. The reversal of 1151861 is 1681511.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 828100 + 323761 = 910^2 + 569^2 .

It is a cyclic number.

It is not a de Polignac number, because 1151861 - 2¹⁰ = 1150837 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1151881) 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, 575930 + 575931.

It is an arithmetic number, because the mean of its divisors is an integer number (575931).

2^1151861 is an apocalyptic number.

It is an amenable number.

1151861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1151861 is an equidigital number, since it uses as much as digits as its factorization.

1151861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240, while the sum is 23.

The square root of 1151861 is about 1073.2478744447. The cubic root of 1151861 is about 104.8254393597.

The spelling of 1151861 in words is "one million, one hundred fifty-one thousand, eight hundred sixty-one".