1421851181 has 2 divisors, whose sum is σ = 1421851182. Its totient is φ = 1421851180.

The previous prime is 1421851169. The next prime is 1421851217. The reversal of 1421851181 is 1811581241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1343882281 + 77968900 = 36659^2 + 8830^2 .

It is a cyclic number.

It is not a de Polignac number, because 1421851181 - 2²⁶ = 1354742317 is a prime.

It is a super-2 number, since 2×1421851181² = 4043321561822189522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1421851381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710925590 + 710925591.

It is an arithmetic number, because the mean of its divisors is an integer number (710925591).

Almost surely, 2^1421851181 is an apocalyptic number.

It is an amenable number.

1421851181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421851181 is an equidigital number, since it uses as much as digits as its factorization.

1421851181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2560, while the sum is 32.

The square root of 1421851181 is about 37707.4419843086. The cubic root of 1421851181 is about 1124.4790822234.

The spelling of 1421851181 in words is "one billion, four hundred twenty-one million, eight hundred fifty-one thousand, one hundred eighty-one".