1855641213 has 12 divisors (see below), whose sum is σ = 2821443040. Its totient is φ = 1171983816.

The previous prime is 1855641211. The next prime is 1855641233. The reversal of 1855641213 is 3121465581.

1855641213 is a `hidden beast` number, since 1 + 8 + 5 + 5 + 641 + 2 + 1 + 3 = 666.

It is not a de Polignac number, because 1855641213 - 2¹ = 1855641211 is a prime.

It is a super-2 number, since 2×1855641213² = 6886808622768222738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1855641211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5425681 + ... + 5426022.

Almost surely, 2^1855641213 is an apocalyptic number.

It is an amenable number.

1855641213 is a deficient number, since it is larger than the sum of its proper divisors (965801827).

1855641213 is a wasteful number, since it uses less digits than its factorization.

1855641213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10851728 (or 10851725 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 1855641213 is about 43077.1541887344. The cubic root of 1855641213 is about 1228.8475364256.

The spelling of 1855641213 in words is "one billion, eight hundred fifty-five million, six hundred forty-one thousand, two hundred thirteen".