201987993371 has 2 divisors, whose sum is σ = 201987993372. Its totient is φ = 201987993370.

The previous prime is 201987993367. The next prime is 201987993377. The reversal of 201987993371 is 173399789102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201987993371 - 2² = 201987993367 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201987993371.

It is not a weakly prime, because it can be changed into another prime (201987993377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100993996685 + 100993996686.

It is an arithmetic number, because the mean of its divisors is an integer number (100993996686).

Almost surely, 2^201987993371 is an apocalyptic number.

201987993371 is a deficient number, since it is larger than the sum of its proper divisors (1).

201987993371 is an equidigital number, since it uses as much as digits as its factorization.

201987993371 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5143824, while the sum is 59.

The spelling of 201987993371 in words is "two hundred one billion, nine hundred eighty-seven million, nine hundred ninety-three thousand, three hundred seventy-one".