19452991 has 2 divisors, whose sum is σ = 19452992. Its totient is φ = 19452990.

The previous prime is 19452989. The next prime is 19453001. The reversal of 19452991 is 19925491.

It is a weak prime.

It is an emirp because it is prime and its reverse (19925491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19452991 - 2¹ = 19452989 is a prime.

Together with 19452989, 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 (19452931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9726495 + 9726496.

It is an arithmetic number, because the mean of its divisors is an integer number (9726496).

Almost surely, 2^19452991 is an apocalyptic number.

19452991 is a deficient number, since it is larger than the sum of its proper divisors (1).

19452991 is an equidigital number, since it uses as much as digits as its factorization.

19452991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 40.

The square root of 19452991 is about 4410.5545002868. The cubic root of 19452991 is about 268.9441664453.

The spelling of 19452991 in words is "nineteen million, four hundred fifty-two thousand, nine hundred ninety-one".