1901855413 has 2 divisors, whose sum is σ = 1901855414. Its totient is φ = 1901855412.

The previous prime is 1901855411. The next prime is 1901855437. The reversal of 1901855413 is 3145581091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1687730724 + 214124689 = 41082^2 + 14633^2 .

It is an emirp because it is prime and its reverse (3145581091) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1901855413 - 2¹ = 1901855411 is a prime.

Together with 1901855411, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1901855411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 950927706 + 950927707.

It is an arithmetic number, because the mean of its divisors is an integer number (950927707).

Almost surely, 2^1901855413 is an apocalyptic number.

It is an amenable number.

1901855413 is a deficient number, since it is larger than the sum of its proper divisors (1).

1901855413 is an equidigital number, since it uses as much as digits as its factorization.

1901855413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 37.

The square root of 1901855413 is about 43610.2672887934. The cubic root of 1901855413 is about 1238.9653641941.

The spelling of 1901855413 in words is "one billion, nine hundred one million, eight hundred fifty-five thousand, four hundred thirteen".