197156969 has 4 divisors (see below), whose sum is σ = 197229396. Its totient is φ = 197084544.

The previous prime is 197156957. The next prime is 197157011. The reversal of 197156969 is 969651791.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 969651791 = 61 ⋅15895931.

It can be written as a sum of positive squares in 2 ways, for example, as 43099225 + 154057744 = 6565^2 + 12412^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197156969 is a prime.

It is a super-2 number, since 2×197156969² = 77741740850533922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 197156969.

It is not an unprimeable number, because it can be changed into a prime (197156909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31964 + ... + 37629.

It is an arithmetic number, because the mean of its divisors is an integer number (49307349).

Almost surely, 2^197156969 is an apocalyptic number.

It is an amenable number.

197156969 is a deficient number, since it is larger than the sum of its proper divisors (72427).

197156969 is an equidigital number, since it uses as much as digits as its factorization.

197156969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72426.

The product of its digits is 918540, while the sum is 53.

The square root of 197156969 is about 14041.2595232764. The cubic root of 197156969 is about 582.0192884181.

The spelling of 197156969 in words is "one hundred ninety-seven million, one hundred fifty-six thousand, nine hundred sixty-nine".