642214451 has 2 divisors, whose sum is σ = 642214452. Its totient is φ = 642214450.

The previous prime is 642214429. The next prime is 642214453. The reversal of 642214451 is 154412246.

642214451 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642214451 - 2⁶ = 642214387 is a prime.

It is a Sophie Germain prime.

Together with 642214453, 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 (642214453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321107225 + 321107226.

It is an arithmetic number, because the mean of its divisors is an integer number (321107226).

Almost surely, 2^642214451 is an apocalyptic number.

642214451 is a deficient number, since it is larger than the sum of its proper divisors (1).

642214451 is an equidigital number, since it uses as much as digits as its factorization.

642214451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7680, while the sum is 29.

The square root of 642214451 is about 25341.9504182295. The cubic root of 642214451 is about 862.7666672739.

Adding to 642214451 its reverse (154412246), we get a palindrome (796626697).

The spelling of 642214451 in words is "six hundred forty-two million, two hundred fourteen thousand, four hundred fifty-one".