197542969 has 4 divisors (see below), whose sum is σ = 212738596. Its totient is φ = 182347344.

The previous prime is 197542951. The next prime is 197542987. The reversal of 197542969 is 969245791.

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

It is an interprime number because it is at equal distance from previous prime (197542951) and next prime (197542987).

It can be written as a sum of positive squares in 2 ways, for example, as 46744569 + 150798400 = 6837^2 + 12280^2 .

It is a cyclic number.

It is not a de Polignac number, because 197542969 - 2⁷ = 197542841 is a prime.

It is a super-2 number, since 2×197542969² = 78046449202669922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197542999) 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 3 ways as a sum of consecutive naturals, for example, 7597794 + ... + 7597819.

It is an arithmetic number, because the mean of its divisors is an integer number (53184649).

Almost surely, 2^197542969 is an apocalyptic number.

It is an amenable number.

197542969 is a deficient number, since it is larger than the sum of its proper divisors (15195627).

197542969 is a wasteful number, since it uses less digits than its factorization.

197542969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15195626.

The product of its digits is 1224720, while the sum is 52.

The square root of 197542969 is about 14054.9980078263. The cubic root of 197542969 is about 582.3988725817.

It can be divided in two parts, 1975 and 42969, that added together give a palindrome (44944).

The spelling of 197542969 in words is "one hundred ninety-seven million, five hundred forty-two thousand, nine hundred sixty-nine".