197212657 has 4 divisors (see below), whose sum is σ = 198245376. Its totient is φ = 196179940.

The previous prime is 197212651. The next prime is 197212661. The reversal of 197212657 is 756212791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 197212657 - 2¹¹ = 197210609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197212651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 516073 + ... + 516454.

It is an arithmetic number, because the mean of its divisors is an integer number (49561344).

Almost surely, 2^197212657 is an apocalyptic number.

It is an amenable number.

197212657 is a deficient number, since it is larger than the sum of its proper divisors (1032719).

197212657 is a wasteful number, since it uses less digits than its factorization.

197212657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032718.

The product of its digits is 52920, while the sum is 40.

The square root of 197212657 is about 14043.2423962559. The cubic root of 197212657 is about 582.0740813735.

The spelling of 197212657 in words is "one hundred ninety-seven million, two hundred twelve thousand, six hundred fifty-seven".