3181961373 has 4 divisors (see below), whose sum is σ = 4242615168. Its totient is φ = 2121307580.

The previous prime is 3181961359. The next prime is 3181961423. The reversal of 3181961373 is 3731691813.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3731691813 = 3 ⋅1243897271.

It is a cyclic number.

It is not a de Polignac number, because 3181961373 - 2⁹ = 3181960861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3181961323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530326893 + ... + 530326898.

It is an arithmetic number, because the mean of its divisors is an integer number (1060653792).

Almost surely, 2^3181961373 is an apocalyptic number.

It is an amenable number.

3181961373 is a deficient number, since it is larger than the sum of its proper divisors (1060653795).

3181961373 is a wasteful number, since it uses less digits than its factorization.

3181961373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060653794.

The product of its digits is 81648, while the sum is 42.

The square root of 3181961373 is about 56408.8767216650. The cubic root of 3181961373 is about 1470.8384272534.

It can be divided in two parts, 318 and 1961373, that added together give a palindrome (1961691).

The spelling of 3181961373 in words is "three billion, one hundred eighty-one million, nine hundred sixty-one thousand, three hundred seventy-three".