203122312391 has 2 divisors, whose sum is σ = 203122312392. Its totient is φ = 203122312390.

The previous prime is 203122312357. The next prime is 203122312403. The reversal of 203122312391 is 193213221302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 203122312391 - 2²² = 203118118087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203122312291) 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, 101561156195 + 101561156196.

It is an arithmetic number, because the mean of its divisors is an integer number (101561156196).

Almost surely, 2^203122312391 is an apocalyptic number.

203122312391 is a deficient number, since it is larger than the sum of its proper divisors (1).

203122312391 is an equidigital number, since it uses as much as digits as its factorization.

203122312391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 29.

Adding to 203122312391 its reverse (193213221302), we get a palindrome (396335533693).

The spelling of 203122312391 in words is "two hundred three billion, one hundred twenty-two million, three hundred twelve thousand, three hundred ninety-one".