3131120191 has 4 divisors (see below), whose sum is σ = 3142424152. Its totient is φ = 3119816232.

The previous prime is 3131120189. The next prime is 3131120221. The reversal of 3131120191 is 1910211313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1910211313 = 12163 ⋅157051.

It is a cyclic number.

It is not a de Polignac number, because 3131120191 - 2¹ = 3131120189 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 (3131120101) 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, 5651565 + ... + 5652118.

It is an arithmetic number, because the mean of its divisors is an integer number (785606038).

Almost surely, 2^3131120191 is an apocalyptic number.

3131120191 is a deficient number, since it is larger than the sum of its proper divisors (11303961).

3131120191 is a wasteful number, since it uses less digits than its factorization.

3131120191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11303960.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 3131120191 is about 55956.4133142931. The cubic root of 3131120191 is about 1462.9626758884.

The spelling of 3131120191 in words is "three billion, one hundred thirty-one million, one hundred twenty thousand, one hundred ninety-one".