3109861781 has 24 divisors (see below), whose sum is σ = 3490058880. Its totient is φ = 2767879296.

The previous prime is 3109861771. The next prime is 3109861787. The reversal of 3109861781 is 1871689013.

It is not a de Polignac number, because 3109861781 - 2¹⁰ = 3109860757 is a prime.

It is a super-2 number, since 2×3109861781² = 19342480593848983922, which contains 22 as substring.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3109861787) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 571385 + ... + 576801.

It is an arithmetic number, because the mean of its divisors is an integer number (145419120).

Almost surely, 2^3109861781 is an apocalyptic number.

It is an amenable number.

3109861781 is a deficient number, since it is larger than the sum of its proper divisors (380197099).

3109861781 is a wasteful number, since it uses less digits than its factorization.

3109861781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5565 (or 5552 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 3109861781 is about 55766.1347145380. The cubic root of 3109861781 is about 1459.6442776642.

The spelling of 3109861781 in words is "three billion, one hundred nine million, eight hundred sixty-one thousand, seven hundred eighty-one".