202438904937991 has 2 divisors, whose sum is σ = 202438904937992. Its totient is φ = 202438904937990.

The previous prime is 202438904937911. The next prime is 202438904938007. The reversal of 202438904937991 is 199739409834202.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202438904937991 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 202438904937991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202438904937911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101219452468995 + 101219452468996.

It is an arithmetic number, because the mean of its divisors is an integer number (101219452468996).

Almost surely, 2^{202438904937991} is an apocalyptic number.

202438904937991 is a deficient number, since it is larger than the sum of its proper divisors (1).

202438904937991 is an equidigital number, since it uses as much as digits as its factorization.

202438904937991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 211631616, while the sum is 70.

The spelling of 202438904937991 in words is "two hundred two trillion, four hundred thirty-eight billion, nine hundred four million, nine hundred thirty-seven thousand, nine hundred ninety-one".