842638451 has 2 divisors, whose sum is σ = 842638452. Its totient is φ = 842638450.

The previous prime is 842638427. The next prime is 842638463. The reversal of 842638451 is 154836248.

842638451 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 a de Polignac number, because none of the positive numbers 2^k-842638451 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 842638399 and 842638408.

It is not a weakly prime, because it can be changed into another prime (842638421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421319225 + 421319226.

It is an arithmetic number, because the mean of its divisors is an integer number (421319226).

Almost surely, 2^842638451 is an apocalyptic number.

842638451 is a deficient number, since it is larger than the sum of its proper divisors (1).

842638451 is an equidigital number, since it uses as much as digits as its factorization.

842638451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 184320, while the sum is 41.

The square root of 842638451 is about 29028.2354096834. The cubic root of 842638451 is about 944.5256527782.

The spelling of 842638451 in words is "eight hundred forty-two million, six hundred thirty-eight thousand, four hundred fifty-one".