201238255591 has 2 divisors, whose sum is σ = 201238255592. Its totient is φ = 201238255590.

The previous prime is 201238255577. The next prime is 201238255681. The reversal of 201238255591 is 195552832102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201238255591 - 2⁹ = 201238255079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201238255291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100619127795 + 100619127796.

It is an arithmetic number, because the mean of its divisors is an integer number (100619127796).

Almost surely, 2^201238255591 is an apocalyptic number.

201238255591 is a deficient number, since it is larger than the sum of its proper divisors (1).

201238255591 is an equidigital number, since it uses as much as digits as its factorization.

201238255591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216000, while the sum is 43.

The spelling of 201238255591 in words is "two hundred one billion, two hundred thirty-eight million, two hundred fifty-five thousand, five hundred ninety-one".