11801861 has 2 divisors, whose sum is σ = 11801862. Its totient is φ = 11801860.

The previous prime is 11801827. The next prime is 11801873. The reversal of 11801861 is 16810811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10201636 + 1600225 = 3194^2 + 1265^2 .

It is a cyclic number.

It is not a de Polignac number, because 11801861 - 2¹⁰ = 11800837 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11801861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11801821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5900930 + 5900931.

It is an arithmetic number, because the mean of its divisors is an integer number (5900931).

Almost surely, 2^11801861 is an apocalyptic number.

It is an amenable number.

11801861 is a deficient number, since it is larger than the sum of its proper divisors (1).

11801861 is an equidigital number, since it uses as much as digits as its factorization.

11801861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 26.

The square root of 11801861 is about 3435.3836758068. The cubic root of 11801861 is about 227.6757792952.

The spelling of 11801861 in words is "eleven million, eight hundred one thousand, eight hundred sixty-one".