201965897 has 6 divisors (see below), whose sum is σ = 234939978. Its totient is φ = 173113584.

The previous prime is 201965893. The next prime is 201965903. The reversal of 201965897 is 798569102.

It can be written as a sum of positive squares in only one way, i.e., 129868816 + 72097081 = 11396^2 + 8491^2 .

It is not a de Polignac number, because 201965897 - 2² = 201965893 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201965891) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2060828 + ... + 2060925.

It is an arithmetic number, because the mean of its divisors is an integer number (39156663).

Almost surely, 2^201965897 is an apocalyptic number.

It is an amenable number.

201965897 is a deficient number, since it is larger than the sum of its proper divisors (32974081).

201965897 is an equidigital number, since it uses as much as digits as its factorization.

201965897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4121767 (or 4121760 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 47.

The square root of 201965897 is about 14211.4706135572. The cubic root of 201965897 is about 586.7134094916.

The spelling of 201965897 in words is "two hundred one million, nine hundred sixty-five thousand, eight hundred ninety-seven".