201431020391 has 2 divisors, whose sum is σ = 201431020392. Its totient is φ = 201431020390.

The previous prime is 201431020379. The next prime is 201431020457. The reversal of 201431020391 is 193020134102.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201431020391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201431020391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201431020291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100715510195 + 100715510196.

It is an arithmetic number, because the mean of its divisors is an integer number (100715510196).

Almost surely, 2^201431020391 is an apocalyptic number.

201431020391 is a deficient number, since it is larger than the sum of its proper divisors (1).

201431020391 is an equidigital number, since it uses as much as digits as its factorization.

201431020391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

Adding to 201431020391 its reverse (193020134102), we get a palindrome (394451154493).

The spelling of 201431020391 in words is "two hundred one billion, four hundred thirty-one million, twenty thousand, three hundred ninety-one".