197066621 has 4 divisors (see below), whose sum is σ = 197101212. Its totient is φ = 197032032.

The previous prime is 197066579. The next prime is 197066641. The reversal of 197066621 is 126660791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126660791 = 331 ⋅382661.

It can be written as a sum of positive squares in 2 ways, for example, as 68244121 + 128822500 = 8261^2 + 11350^2 .

It is a cyclic number.

It is not a de Polignac number, because 197066621 - 2¹⁸ = 196804477 is a prime.

It is a super-2 number, since 2×197066621² = 77670506224715282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197066641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6506 + ... + 20891.

It is an arithmetic number, because the mean of its divisors is an integer number (49275303).

Almost surely, 2^197066621 is an apocalyptic number.

It is an amenable number.

197066621 is a deficient number, since it is larger than the sum of its proper divisors (34591).

197066621 is an equidigital number, since it uses as much as digits as its factorization.

197066621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34590.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 197066621 is about 14038.0419218636. The cubic root of 197066621 is about 581.9303705822.

The spelling of 197066621 in words is "one hundred ninety-seven million, sixty-six thousand, six hundred twenty-one".