3109658391881 has 2 divisors, whose sum is σ = 3109658391882. Its totient is φ = 3109658391880.

The previous prime is 3109658391823. The next prime is 3109658391883. The reversal of 3109658391881 is 1881938569013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2971110663481 + 138547728400 = 1723691^2 + 372220^2 .

It is a cyclic number.

It is not a de Polignac number, because 3109658391881 - 2¹⁸ = 3109658129737 is a prime.

It is a super-2 number, since 2×3109658391881² (a number of 26 digits) contains 22 as substring.

Together with 3109658391883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3109658391883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1554829195940 + 1554829195941.

It is an arithmetic number, because the mean of its divisors is an integer number (1554829195941).

Almost surely, 2^{3109658391881} is an apocalyptic number.

It is an amenable number.

3109658391881 is a deficient number, since it is larger than the sum of its proper divisors (1).

3109658391881 is an equidigital number, since it uses as much as digits as its factorization.

3109658391881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11197440, while the sum is 62.

The spelling of 3109658391881 in words is "three trillion, one hundred nine billion, six hundred fifty-eight million, three hundred ninety-one thousand, eight hundred eighty-one".