139194197 has 2 divisors, whose sum is σ = 139194198. Its totient is φ = 139194196.

The previous prime is 139194163. The next prime is 139194217. The reversal of 139194197 is 791491931.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108347281 + 30846916 = 10409^2 + 5554^2 .

It is a cyclic number.

It is not a de Polignac number, because 139194197 - 2⁸ = 139193941 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 (139194697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69597098 + 69597099.

It is an arithmetic number, because the mean of its divisors is an integer number (69597099).

Almost surely, 2^139194197 is an apocalyptic number.

It is an amenable number.

139194197 is a deficient number, since it is larger than the sum of its proper divisors (1).

139194197 is an equidigital number, since it uses as much as digits as its factorization.

139194197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236, while the sum is 44.

The square root of 139194197 is about 11798.0590352820. The cubic root of 139194197 is about 518.2512719304.

The spelling of 139194197 in words is "one hundred thirty-nine million, one hundred ninety-four thousand, one hundred ninety-seven".