239661197 has 2 divisors, whose sum is σ = 239661198. Its totient is φ = 239661196.

The previous prime is 239661187. The next prime is 239661229. The reversal of 239661197 is 791166932.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150283081 + 89378116 = 12259^2 + 9454^2 .

It is a cyclic number.

It is not a de Polignac number, because 239661197 - 2¹⁶ = 239595661 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (239661137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119830598 + 119830599.

It is an arithmetic number, because the mean of its divisors is an integer number (119830599).

Almost surely, 2^239661197 is an apocalyptic number.

It is an amenable number.

239661197 is a deficient number, since it is larger than the sum of its proper divisors (1).

239661197 is an equidigital number, since it uses as much as digits as its factorization.

239661197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 44.

The square root of 239661197 is about 15480.9947031836. The cubic root of 239661197 is about 621.1539357851.

The spelling of 239661197 in words is "two hundred thirty-nine million, six hundred sixty-one thousand, one hundred ninety-seven".