19442231 has 2 divisors, whose sum is σ = 19442232. Its totient is φ = 19442230.

The previous prime is 19442191. The next prime is 19442233. The reversal of 19442231 is 13224491.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19442231 - 2⁶ = 19442167 is a prime.

It is a super-2 number, since 2×19442231² = 756000692514722, which contains 22 as substring.

Together with 19442233, 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 19442231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19442233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9721115 + 9721116.

It is an arithmetic number, because the mean of its divisors is an integer number (9721116).

Almost surely, 2^19442231 is an apocalyptic number.

19442231 is a deficient number, since it is larger than the sum of its proper divisors (1).

19442231 is an equidigital number, since it uses as much as digits as its factorization.

19442231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 26.

The square root of 19442231 is about 4409.3345302891. The cubic root of 19442231 is about 268.8945704226.

The spelling of 19442231 in words is "nineteen million, four hundred forty-two thousand, two hundred thirty-one".