19702129 has 2 divisors, whose sum is σ = 19702130. Its totient is φ = 19702128.

The previous prime is 19702079. The next prime is 19702139. The reversal of 19702129 is 92120791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14630625 + 5071504 = 3825^2 + 2252^2 .

It is a cyclic number.

It is not a de Polignac number, because 19702129 - 2²³ = 11313521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19702129.

It is not a weakly prime, because it can be changed into another prime (19702139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9851064 + 9851065.

It is an arithmetic number, because the mean of its divisors is an integer number (9851065).

Almost surely, 2^19702129 is an apocalyptic number.

It is an amenable number.

19702129 is a deficient number, since it is larger than the sum of its proper divisors (1).

19702129 is an equidigital number, since it uses as much as digits as its factorization.

19702129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 19702129 is about 4438.7080327501. The cubic root of 19702129 is about 270.0874385299.

The spelling of 19702129 in words is "nineteen million, seven hundred two thousand, one hundred twenty-nine".