242020451 has 2 divisors, whose sum is σ = 242020452. Its totient is φ = 242020450.

The previous prime is 242020409. The next prime is 242020453. The reversal of 242020451 is 154020242.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242020451 is a prime.

Together with 242020453, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (242020453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121010225 + 121010226.

It is an arithmetic number, because the mean of its divisors is an integer number (121010226).

Almost surely, 2^242020451 is an apocalyptic number.

242020451 is a deficient number, since it is larger than the sum of its proper divisors (1).

242020451 is an equidigital number, since it uses as much as digits as its factorization.

242020451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 242020451 is about 15557.0064922529. The cubic root of 242020451 is about 623.1855222237.

Adding to 242020451 its reverse (154020242), we get a palindrome (396040693).

The spelling of 242020451 in words is "two hundred forty-two million, twenty thousand, four hundred fifty-one".