210191077897 has 2 divisors, whose sum is σ = 210191077898. Its totient is φ = 210191077896.

The previous prime is 210191077883. The next prime is 210191077933. The reversal of 210191077897 is 798770191012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122352344521 + 87838733376 = 349789^2 + 296376^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210191077897 is a prime.

It is not a weakly prime, because it can be changed into another prime (210191077297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105095538948 + 105095538949.

It is an arithmetic number, because the mean of its divisors is an integer number (105095538949).

Almost surely, 2^210191077897 is an apocalyptic number.

It is an amenable number.

210191077897 is a deficient number, since it is larger than the sum of its proper divisors (1).

210191077897 is an equidigital number, since it uses as much as digits as its factorization.

210191077897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 444528, while the sum is 52.

The spelling of 210191077897 in words is "two hundred ten billion, one hundred ninety-one million, seventy-seven thousand, eight hundred ninety-seven".