1881936861 has 32 divisors (see below), whose sum is σ = 2924802048. Its totient is φ = 1054166400.

The previous prime is 1881936857. The next prime is 1881936869. The reversal of 1881936861 is 1686391881.

It is not a de Polignac number, because 1881936861 - 2² = 1881936857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881936869) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 252336 + ... + 259686.

It is an arithmetic number, because the mean of its divisors is an integer number (91400064).

Almost surely, 2^1881936861 is an apocalyptic number.

It is an amenable number.

1881936861 is a deficient number, since it is larger than the sum of its proper divisors (1042865187).

1881936861 is a wasteful number, since it uses less digits than its factorization.

1881936861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7601.

The product of its digits is 497664, while the sum is 51.

The square root of 1881936861 is about 43381.2962116164. The cubic root of 1881936861 is about 1234.6248563628.

The spelling of 1881936861 in words is "one billion, eight hundred eighty-one million, nine hundred thirty-six thousand, eight hundred sixty-one".