19957141 has 2 divisors, whose sum is σ = 19957142. Its totient is φ = 19957140.

The previous prime is 19957139. The next prime is 19957153. The reversal of 19957141 is 14175991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19838116 + 119025 = 4454^2 + 345^2 .

It is a cyclic number.

It is not a de Polignac number, because 19957141 - 2¹ = 19957139 is a prime.

Together with 19957139, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19957141.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19957111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9978570 + 9978571.

It is an arithmetic number, because the mean of its divisors is an integer number (9978571).

Almost surely, 2^19957141 is an apocalyptic number.

It is an amenable number.

19957141 is a deficient number, since it is larger than the sum of its proper divisors (1).

19957141 is an equidigital number, since it uses as much as digits as its factorization.

19957141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 37.

The square root of 19957141 is about 4467.3416032356. The cubic root of 19957141 is about 271.2477276173.

The spelling of 19957141 in words is "nineteen million, nine hundred fifty-seven thousand, one hundred forty-one".