1855783081 has 2 divisors, whose sum is σ = 1855783082. Its totient is φ = 1855783080.

The previous prime is 1855783049. The next prime is 1855783133. The reversal of 1855783081 is 1803875581.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1595283481 + 260499600 = 39941^2 + 16140^2 .

It is a cyclic number.

It is not a de Polignac number, because 1855783081 - 2⁵ = 1855783049 is a prime.

It is a super-2 number, since 2×1855783081² = 6887861687451705122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1855783001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 927891540 + 927891541.

It is an arithmetic number, because the mean of its divisors is an integer number (927891541).

Almost surely, 2^1855783081 is an apocalyptic number.

It is an amenable number.

1855783081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1855783081 is an equidigital number, since it uses as much as digits as its factorization.

1855783081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 268800, while the sum is 46.

The square root of 1855783081 is about 43078.8008305709. The cubic root of 1855783081 is about 1228.8788516925.

The spelling of 1855783081 in words is "one billion, eight hundred fifty-five million, seven hundred eighty-three thousand, eighty-one".