1861049413 has 2 divisors, whose sum is σ = 1861049414. Its totient is φ = 1861049412.

The previous prime is 1861049383. The next prime is 1861049429. The reversal of 1861049413 is 3149401681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1793776609 + 67272804 = 42353^2 + 8202^2 .

It is an emirp because it is prime and its reverse (3149401681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1861049413 - 2¹⁷ = 1860918341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1861049513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 930524706 + 930524707.

It is an arithmetic number, because the mean of its divisors is an integer number (930524707).

Almost surely, 2^1861049413 is an apocalyptic number.

It is an amenable number.

1861049413 is a deficient number, since it is larger than the sum of its proper divisors (1).

1861049413 is an equidigital number, since it uses as much as digits as its factorization.

1861049413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 1861049413 is about 43139.8819307610. The cubic root of 1861049413 is about 1230.0401892700.

The spelling of 1861049413 in words is "one billion, eight hundred sixty-one million, forty-nine thousand, four hundred thirteen".