422642257 has 2 divisors, whose sum is σ = 422642258. Its totient is φ = 422642256.

The previous prime is 422642243. The next prime is 422642267. The reversal of 422642257 is 752246224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 408080401 + 14561856 = 20201^2 + 3816^2 .

It is a cyclic number.

It is not a de Polignac number, because 422642257 - 2²³ = 414253649 is a prime.

It is not a weakly prime, because it can be changed into another prime (422642237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211321128 + 211321129.

It is an arithmetic number, because the mean of its divisors is an integer number (211321129).

Almost surely, 2^422642257 is an apocalyptic number.

It is an amenable number.

422642257 is a deficient number, since it is larger than the sum of its proper divisors (1).

422642257 is an equidigital number, since it uses as much as digits as its factorization.

422642257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53760, while the sum is 34.

The square root of 422642257 is about 20558.2649316522. The cubic root of 422642257 is about 750.4543954589.

It can be divided in two parts, 42264 and 2257, that added together give a square (44521 = 211²).

The spelling of 422642257 in words is "four hundred twenty-two million, six hundred forty-two thousand, two hundred fifty-seven".