201631803851 has 2 divisors, whose sum is σ = 201631803852. Its totient is φ = 201631803850.

The previous prime is 201631803739. The next prime is 201631803853. The reversal of 201631803851 is 158308136102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201631803851 is a prime.

Together with 201631803853, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (201631803853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100815901925 + 100815901926.

It is an arithmetic number, because the mean of its divisors is an integer number (100815901926).

Almost surely, 2^201631803851 is an apocalyptic number.

201631803851 is a deficient number, since it is larger than the sum of its proper divisors (1).

201631803851 is an equidigital number, since it uses as much as digits as its factorization.

201631803851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 38.

Adding to 201631803851 its reverse (158308136102), we get a palindrome (359939939953).

The spelling of 201631803851 in words is "two hundred one billion, six hundred thirty-one million, eight hundred three thousand, eight hundred fifty-one".