197653901 has 2 divisors, whose sum is σ = 197653902. Its totient is φ = 197653900.

The previous prime is 197653891. The next prime is 197653943. The reversal of 197653901 is 109356791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197262025 + 391876 = 14045^2 + 626^2 .

It is an emirp because it is prime and its reverse (109356791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 197653901 - 2²² = 193459597 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197653961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98826950 + 98826951.

It is an arithmetic number, because the mean of its divisors is an integer number (98826951).

Almost surely, 2^197653901 is an apocalyptic number.

It is an amenable number.

197653901 is a deficient number, since it is larger than the sum of its proper divisors (1).

197653901 is an equidigital number, since it uses as much as digits as its factorization.

197653901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51030, while the sum is 41.

The square root of 197653901 is about 14058.9438081244. The cubic root of 197653901 is about 582.5078692595.

The spelling of 197653901 in words is "one hundred ninety-seven million, six hundred fifty-three thousand, nine hundred one".