19958959 has 2 divisors, whose sum is σ = 19958960. Its totient is φ = 19958958.

The previous prime is 19958957. The next prime is 19958977. The reversal of 19958959 is 95985991.

It is a weak prime.

It is an emirp because it is prime and its reverse (95985991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19958959 - 2¹ = 19958957 is a prime.

Together with 19958957, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19958957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9979479 + 9979480.

It is an arithmetic number, because the mean of its divisors is an integer number (9979480).

Almost surely, 2^19958959 is an apocalyptic number.

19958959 is a deficient number, since it is larger than the sum of its proper divisors (1).

19958959 is an equidigital number, since it uses as much as digits as its factorization.

19958959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1312200, while the sum is 55.

The square root of 19958959 is about 4467.5450753182. The cubic root of 19958959 is about 271.2559638237.

The spelling of 19958959 in words is "nineteen million, nine hundred fifty-eight thousand, nine hundred fifty-nine".