125709197 has 2 divisors, whose sum is σ = 125709198. Its totient is φ = 125709196.

The previous prime is 125709193. The next prime is 125709211. The reversal of 125709197 is 791907521.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122301481 + 3407716 = 11059^2 + 1846^2 .

It is an emirp because it is prime and its reverse (791907521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125709197 - 2² = 125709193 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125709193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62854598 + 62854599.

It is an arithmetic number, because the mean of its divisors is an integer number (62854599).

Almost surely, 2^125709197 is an apocalyptic number.

It is an amenable number.

125709197 is a deficient number, since it is larger than the sum of its proper divisors (1).

125709197 is an equidigital number, since it uses as much as digits as its factorization.

125709197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39690, while the sum is 41.

The square root of 125709197 is about 11212.0112825487. The cubic root of 125709197 is about 500.9438133119.

The spelling of 125709197 in words is "one hundred twenty-five million, seven hundred nine thousand, one hundred ninety-seven".