19725197 has 2 divisors, whose sum is σ = 19725198. Its totient is φ = 19725196.

The previous prime is 19725193. The next prime is 19725203. The reversal of 19725197 is 79152791.

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., 15319396 + 4405801 = 3914^2 + 2099^2 .

It is a cyclic number.

It is not a de Polignac number, because 19725197 - 2² = 19725193 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19725193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9862598 + 9862599.

It is an arithmetic number, because the mean of its divisors is an integer number (9862599).

Almost surely, 2^19725197 is an apocalyptic number.

It is an amenable number.

19725197 is a deficient number, since it is larger than the sum of its proper divisors (1).

19725197 is an equidigital number, since it uses as much as digits as its factorization.

19725197 is an odious number, because the sum of its binary digits is odd.

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

The square root of 19725197 is about 4441.3057764581. The cubic root of 19725197 is about 270.1928069569.

The spelling of 19725197 in words is "nineteen million, seven hundred twenty-five thousand, one hundred ninety-seven".