3121203391 has 2 divisors, whose sum is σ = 3121203392. Its totient is φ = 3121203390.

The previous prime is 3121203353. The next prime is 3121203469. The reversal of 3121203391 is 1933021213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3121203391 - 2²⁵ = 3087648959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3121203691) 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 as a sum of consecutive naturals, namely, 1560601695 + 1560601696.

It is an arithmetic number, because the mean of its divisors is an integer number (1560601696).

Almost surely, 2^3121203391 is an apocalyptic number.

3121203391 is a deficient number, since it is larger than the sum of its proper divisors (1).

3121203391 is an equidigital number, since it uses as much as digits as its factorization.

3121203391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 3121203391 is about 55867.7312140022. The cubic root of 3121203391 is about 1461.4165570621.

The spelling of 3121203391 in words is "three billion, one hundred twenty-one million, two hundred three thousand, three hundred ninety-one".