197220139 has 2 divisors, whose sum is σ = 197220140. Its totient is φ = 197220138.

The previous prime is 197220091. The next prime is 197220161. The reversal of 197220139 is 931022791.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 197220139 - 2¹³ = 197211947 is a prime.

It is not a weakly prime, because it can be changed into another prime (197220169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98610069 + 98610070.

It is an arithmetic number, because the mean of its divisors is an integer number (98610070).

Almost surely, 2^197220139 is an apocalyptic number.

197220139 is a deficient number, since it is larger than the sum of its proper divisors (1).

197220139 is an equidigital number, since it uses as much as digits as its factorization.

197220139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 197220139 is about 14043.5087852004. The cubic root of 197220139 is about 582.0814423331.

The spelling of 197220139 in words is "one hundred ninety-seven million, two hundred twenty thousand, one hundred thirty-nine".