201987793871 has 2 divisors, whose sum is σ = 201987793872. Its totient is φ = 201987793870.

The previous prime is 201987793801. The next prime is 201987793877. The reversal of 201987793871 is 178397789102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201987793871 - 2¹⁰ = 201987792847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201987793877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100993896935 + 100993896936.

It is an arithmetic number, because the mean of its divisors is an integer number (100993896936).

Almost surely, 2^201987793871 is an apocalyptic number.

201987793871 is a deficient number, since it is larger than the sum of its proper divisors (1).

201987793871 is an equidigital number, since it uses as much as digits as its factorization.

201987793871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10668672, while the sum is 62.

The spelling of 201987793871 in words is "two hundred one billion, nine hundred eighty-seven million, seven hundred ninety-three thousand, eight hundred seventy-one".