201985788397 has 2 divisors, whose sum is σ = 201985788398. Its totient is φ = 201985788396.

The previous prime is 201985788379. The next prime is 201985788419. The reversal of 201985788397 is 793887589102.

Together with previous prime (201985788379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130403320996 + 71582467401 = 361114^2 + 267549^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201985788397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201985788097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100992894198 + 100992894199.

It is an arithmetic number, because the mean of its divisors is an integer number (100992894199).

Almost surely, 2^201985788397 is an apocalyptic number.

It is an amenable number.

201985788397 is a deficient number, since it is larger than the sum of its proper divisors (1).

201985788397 is an equidigital number, since it uses as much as digits as its factorization.

201985788397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60963840, while the sum is 67.

The spelling of 201985788397 in words is "two hundred one billion, nine hundred eighty-five million, seven hundred eighty-eight thousand, three hundred ninety-seven".