1860991001 has 2 divisors, whose sum is σ = 1860991002. Its totient is φ = 1860991000.

The previous prime is 1860990959. The next prime is 1860991007. The reversal of 1860991001 is 1001990681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1190181001 + 670810000 = 34499^2 + 25900^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1860991001 is a prime.

It is not a weakly prime, because it can be changed into another prime (1860991007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 930495500 + 930495501.

It is an arithmetic number, because the mean of its divisors is an integer number (930495501).

Almost surely, 2^1860991001 is an apocalyptic number.

It is an amenable number.

1860991001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1860991001 is an equidigital number, since it uses as much as digits as its factorization.

1860991001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 35.

The square root of 1860991001 is about 43139.2049184961. The cubic root of 1860991001 is about 1230.0273202119.

The spelling of 1860991001 in words is "one billion, eight hundred sixty million, nine hundred ninety-one thousand, one".