197066945 has 4 divisors (see below), whose sum is σ = 236480340. Its totient is φ = 157653552.

The previous prime is 197066887. The next prime is 197066999. The reversal of 197066945 is 549660791.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 149401729 + 47665216 = 12223^2 + 6904^2 .

It is a cyclic number.

It is not a de Polignac number, because 197066945 - 2¹⁴ = 197050561 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 197066945.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 19706690 + ... + 19706699.

It is an arithmetic number, because the mean of its divisors is an integer number (59120085).

Almost surely, 2^197066945 is an apocalyptic number.

It is an amenable number.

197066945 is a deficient number, since it is larger than the sum of its proper divisors (39413395).

197066945 is an equidigital number, since it uses as much as digits as its factorization.

197066945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39413394.

The product of its (nonzero) digits is 408240, while the sum is 47.

The square root of 197066945 is about 14038.0534619298. The cubic root of 197066945 is about 581.9306895020.

The spelling of 197066945 in words is "one hundred ninety-seven million, sixty-six thousand, nine hundred forty-five".