197816641 has 32 divisors (see below), whose sum is σ = 237714048. Its totient is φ = 162570240.

The previous prime is 197816621. The next prime is 197816683. The reversal of 197816641 is 146618791.

It is a 4-Lehmer number, since φ(197816641) divides (197816641-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 197816641 - 2⁵ = 197816609 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a deceptive number, since it divides R_197816640.

It is not an unprimeable number, because it can be changed into a prime (197816621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 586825 + ... + 587161.

It is an arithmetic number, because the mean of its divisors is an integer number (7428564).

Almost surely, 2^197816641 is an apocalyptic number.

197816641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

197816641 is a deficient number, since it is larger than the sum of its proper divisors (39897407).

197816641 is a wasteful number, since it uses less digits than its factorization.

197816641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481.

The product of its digits is 72576, while the sum is 43.

The square root of 197816641 is about 14064.7303920125. The cubic root of 197816641 is about 582.6676963186.

The spelling of 197816641 in words is "one hundred ninety-seven million, eight hundred sixteen thousand, six hundred forty-one".