197877137 has 2 divisors, whose sum is σ = 197877138. Its totient is φ = 197877136.

The previous prime is 197877083. The next prime is 197877139. The reversal of 197877137 is 731778791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128504896 + 69372241 = 11336^2 + 8329^2 .

It is a cyclic number.

It is not a de Polignac number, because 197877137 - 2²⁴ = 181099921 is a prime.

It is a super-2 number, since 2×197877137² = 78310722694633538, which contains 22 as substring.

Together with 197877139, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (197877139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98938568 + 98938569.

It is an arithmetic number, because the mean of its divisors is an integer number (98938569).

Almost surely, 2^197877137 is an apocalyptic number.

It is an amenable number.

197877137 is a deficient number, since it is larger than the sum of its proper divisors (1).

197877137 is an equidigital number, since it uses as much as digits as its factorization.

197877137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518616, while the sum is 50.

The square root of 197877137 is about 14066.8808553993. The cubic root of 197877137 is about 582.7270871297.

The spelling of 197877137 in words is "one hundred ninety-seven million, eight hundred seventy-seven thousand, one hundred thirty-seven".