197742913 has 4 divisors (see below), whose sum is σ = 199002580. Its totient is φ = 196483248.

The previous prime is 197742901. The next prime is 197742931. The reversal of 197742913 is 319247791.

It is a happy number.

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 148644864 + 49098049 = 12192^2 + 7007^2 .

It is a cyclic number.

It is not a de Polignac number, because 197742913 - 2¹³ = 197734721 is a prime.

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 197742913.

It is not an unprimeable number, because it can be changed into a prime (197742943) 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, 629598 + ... + 629911.

It is an arithmetic number, because the mean of its divisors is an integer number (49750645).

Almost surely, 2^197742913 is an apocalyptic number.

It is an amenable number.

197742913 is a deficient number, since it is larger than the sum of its proper divisors (1259667).

197742913 is a wasteful number, since it uses less digits than its factorization.

197742913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1259666.

The product of its digits is 95256, while the sum is 43.

The square root of 197742913 is about 14062.1091234566. The cubic root of 197742913 is about 582.5952988670.

The spelling of 197742913 in words is "one hundred ninety-seven million, seven hundred forty-two thousand, nine hundred thirteen".