1861338231 has 8 divisors (see below), whose sum is σ = 2757538160. Its totient is φ = 1240892136.

The previous prime is 1861338229. The next prime is 1861338263. The reversal of 1861338231 is 1328331681.

1861338231 is a `hidden beast` number, since 1 + 8 + 613 + 3 + 8 + 2 + 31 = 666.

It is not a de Polignac number, because 1861338231 - 2¹ = 1861338229 is a prime.

It is a super-2 number, since 2×1861338231² = 6929160020364418722, 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 (1861338221) 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 7 ways as a sum of consecutive naturals, for example, 34469200 + ... + 34469253.

It is an arithmetic number, because the mean of its divisors is an integer number (344692270).

Almost surely, 2^1861338231 is an apocalyptic number.

1861338231 is a deficient number, since it is larger than the sum of its proper divisors (896199929).

1861338231 is an equidigital number, since it uses as much as digits as its factorization.

1861338231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68938462 (or 68938456 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 1861338231 is about 43143.2292602211. The cubic root of 1861338231 is about 1230.1038163414.

The spelling of 1861338231 in words is "one billion, eight hundred sixty-one million, three hundred thirty-eight thousand, two hundred thirty-one".