1861421411 has 2 divisors, whose sum is σ = 1861421412. Its totient is φ = 1861421410.

The previous prime is 1861421399. The next prime is 1861421423. The reversal of 1861421411 is 1141241681.

It is a balanced prime because it is at equal distance from previous prime (1861421399) and next prime (1861421423).

It is an emirp because it is prime and its reverse (1141241681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1861421411 - 2¹⁰ = 1861420387 is a prime.

It is a super-3 number, since 3×1861421411³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1861421461) 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, 930710705 + 930710706.

It is an arithmetic number, because the mean of its divisors is an integer number (930710706).

Almost surely, 2^1861421411 is an apocalyptic number.

1861421411 is a deficient number, since it is larger than the sum of its proper divisors (1).

1861421411 is an equidigital number, since it uses as much as digits as its factorization.

1861421411 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1536, while the sum is 29.

The square root of 1861421411 is about 43144.1932477593. The cubic root of 1861421411 is about 1230.1221398088.

The spelling of 1861421411 in words is "one billion, eight hundred sixty-one million, four hundred twenty-one thousand, four hundred eleven".