197039917 has 4 divisors (see below), whose sum is σ = 197217436. Its totient is φ = 196862400.

The previous prime is 197039903. The next prime is 197039923. The reversal of 197039917 is 719930791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 719930791 = 827 ⋅870533.

It can be written as a sum of positive squares in 2 ways, for example, as 118788201 + 78251716 = 10899^2 + 8846^2 .

It is a cyclic number.

It is not a de Polignac number, because 197039917 - 2¹⁵ = 197007149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197039987) 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, 87084 + ... + 89317.

It is an arithmetic number, because the mean of its divisors is an integer number (49304359).

Almost surely, 2^197039917 is an apocalyptic number.

It is an amenable number.

197039917 is a deficient number, since it is larger than the sum of its proper divisors (177519).

197039917 is a wasteful number, since it uses less digits than its factorization.

197039917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177518.

The product of its (nonzero) digits is 107163, while the sum is 46.

The square root of 197039917 is about 14037.0907598405. The cubic root of 197039917 is about 581.9040840900.

The spelling of 197039917 in words is "one hundred ninety-seven million, thirty-nine thousand, nine hundred seventeen".