1855106901 has 16 divisors (see below), whose sum is σ = 2800163520. Its totient is φ = 1213402320.

The previous prime is 1855106893. The next prime is 1855106909. The reversal of 1855106901 is 1096015581.

1855106901 is a `hidden beast` number, since 1 + 85 + 510 + 69 + 0 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (1855106893) and next prime (1855106909).

It is not a de Polignac number, because 1855106901 - 2³ = 1855106893 is a prime.

It is a super-2 number, since 2×1855106901² = 6882843228275647602, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1855106909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 646755 + ... + 649616.

It is an arithmetic number, because the mean of its divisors is an integer number (175010220).

Almost surely, 2^1855106901 is an apocalyptic number.

It is an amenable number.

1855106901 is a deficient number, since it is larger than the sum of its proper divisors (945056619).

1855106901 is a wasteful number, since it uses less digits than its factorization.

1855106901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1296433 (or 1296427 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 36.

The square root of 1855106901 is about 43070.9519397935. The cubic root of 1855106901 is about 1228.7295806107.

The spelling of 1855106901 in words is "one billion, eight hundred fifty-five million, one hundred six thousand, nine hundred one".