197097139 has 2 divisors, whose sum is σ = 197097140. Its totient is φ = 197097138.

The previous prime is 197097119. The next prime is 197097169. The reversal of 197097139 is 931790791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 197097139 - 2²⁵ = 163542707 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (197097119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98548569 + 98548570.

It is an arithmetic number, because the mean of its divisors is an integer number (98548570).

Almost surely, 2^197097139 is an apocalyptic number.

197097139 is a deficient number, since it is larger than the sum of its proper divisors (1).

197097139 is an equidigital number, since it uses as much as digits as its factorization.

197097139 is an evil number, because the sum of its binary digits is even.

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

The square root of 197097139 is about 14039.1288547402. The cubic root of 197097139 is about 581.9604085364.

The spelling of 197097139 in words is "one hundred ninety-seven million, ninety-seven thousand, one hundred thirty-nine".