3161881693 has 4 divisors (see below), whose sum is σ = 3163363420. Its totient is φ = 3160399968.

The previous prime is 3161881669. The next prime is 3161881703. The reversal of 3161881693 is 3961881613.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1768875364 + 1393006329 = 42058^2 + 37323^2 .

It is a cyclic number.

It is not a de Polignac number, because 3161881693 - 2²⁹ = 2625010781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3161881643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 737658 + ... + 741931.

It is an arithmetic number, because the mean of its divisors is an integer number (790840855).

Almost surely, 2^3161881693 is an apocalyptic number.

It is an amenable number.

3161881693 is a deficient number, since it is larger than the sum of its proper divisors (1481727).

3161881693 is a wasteful number, since it uses less digits than its factorization.

3161881693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1481726.

The product of its digits is 186624, while the sum is 46.

The square root of 3161881693 is about 56230.6117075032. The cubic root of 3161881693 is about 1467.7380011719.

It can be divided in two parts, 31618 and 81693, that added together give a palindrome (113311).

The spelling of 3161881693 in words is "three billion, one hundred sixty-one million, eight hundred eighty-one thousand, six hundred ninety-three".