4242991 has 2 divisors, whose sum is σ = 4242992. Its totient is φ = 4242990.

The previous prime is 4242989. The next prime is 4243003. The reversal of 4242991 is 1992424.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4242991 - 2¹ = 4242989 is a prime.

Together with 4242989, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4242941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2121495 + 2121496.

It is an arithmetic number, because the mean of its divisors is an integer number (2121496).

Almost surely, 2^4242991 is an apocalyptic number.

4242991 is a deficient number, since it is larger than the sum of its proper divisors (1).

4242991 is an equidigital number, since it uses as much as digits as its factorization.

4242991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 31.

The square root of 4242991 is about 2059.8521791624. The cubic root of 4242991 is about 161.8914962095.

The spelling of 4242991 in words is "four million, two hundred forty-two thousand, nine hundred ninety-one".