201010200111991 has 2 divisors, whose sum is σ = 201010200111992. Its totient is φ = 201010200111990.

The previous prime is 201010200111983. The next prime is 201010200112147. The reversal of 201010200111991 is 199111002010102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201010200111991 - 2³ = 201010200111983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201010200111901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100505100055995 + 100505100055996.

It is an arithmetic number, because the mean of its divisors is an integer number (100505100055996).

Almost surely, 2^{201010200111991} is an apocalyptic number.

201010200111991 is a deficient number, since it is larger than the sum of its proper divisors (1).

201010200111991 is an equidigital number, since it uses as much as digits as its factorization.

201010200111991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 28.

The spelling of 201010200111991 in words is "two hundred one trillion, ten billion, two hundred million, one hundred eleven thousand, nine hundred ninety-one".