19957129 has 2 divisors, whose sum is σ = 19957130. Its totient is φ = 19957128.

The previous prime is 19957127. The next prime is 19957139. The reversal of 19957129 is 92175991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12924025 + 7033104 = 3595^2 + 2652^2 .

It is a cyclic number.

It is not a de Polignac number, because 19957129 - 2¹ = 19957127 is a prime.

Together with 19957127, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19957127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9978564 + 9978565.

It is an arithmetic number, because the mean of its divisors is an integer number (9978565).

Almost surely, 2^19957129 is an apocalyptic number.

It is an amenable number.

19957129 is a deficient number, since it is larger than the sum of its proper divisors (1).

19957129 is an equidigital number, since it uses as much as digits as its factorization.

19957129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51030, while the sum is 43.

The square root of 19957129 is about 4467.3402601548. The cubic root of 19957129 is about 271.2476732512.

The spelling of 19957129 in words is "nineteen million, nine hundred fifty-seven thousand, one hundred twenty-nine".