1861310055 has 32 divisors (see below), whose sum is σ = 3250844928. Its totient is φ = 901894400.

The previous prime is 1861310039. The next prime is 1861310057. The reversal of 1861310055 is 5500131681.

It is not a de Polignac number, because 1861310055 - 2⁴ = 1861310039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861310057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 415387 + ... + 419843.

It is an arithmetic number, because the mean of its divisors is an integer number (101588904).

Almost surely, 2^1861310055 is an apocalyptic number.

1861310055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1861310055 is a deficient number, since it is larger than the sum of its proper divisors (1389534873).

1861310055 is a wasteful number, since it uses less digits than its factorization.

1861310055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7007.

The product of its (nonzero) digits is 3600, while the sum is 30.

The square root of 1861310055 is about 43142.9027187555. The cubic root of 1861310055 is about 1230.0976094129.

The spelling of 1861310055 in words is "one billion, eight hundred sixty-one million, three hundred ten thousand, fifty-five".