1866121241 has 2 divisors, whose sum is σ = 1866121242. Its totient is φ = 1866121240.

The previous prime is 1866121223. The next prime is 1866121253. The reversal of 1866121241 is 1421216681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1270566025 + 595555216 = 35645^2 + 24404^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1866121241 is a prime.

It is a super-2 number, since 2×1866121241² = 6964816972222760162, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1866121198 and 1866121207.

It is not a weakly prime, because it can be changed into another prime (1866121141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 933060620 + 933060621.

It is an arithmetic number, because the mean of its divisors is an integer number (933060621).

Almost surely, 2^1866121241 is an apocalyptic number.

It is an amenable number.

1866121241 is a deficient number, since it is larger than the sum of its proper divisors (1).

1866121241 is an equidigital number, since it uses as much as digits as its factorization.

1866121241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 32.

The square root of 1866121241 is about 43198.6254526692. The cubic root of 1866121241 is about 1231.1565654368.

The spelling of 1866121241 in words is "one billion, eight hundred sixty-six million, one hundred twenty-one thousand, two hundred forty-one".