422997661 has 2 divisors, whose sum is σ = 422997662. Its totient is φ = 422997660.

The previous prime is 422997637. The next prime is 422997709. The reversal of 422997661 is 166799224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 365995161 + 57002500 = 19131^2 + 7550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-422997661 is a prime.

It is a super-2 number, since 2×422997661² = 357854042422941842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (422997461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211498830 + 211498831.

It is an arithmetic number, because the mean of its divisors is an integer number (211498831).

Almost surely, 2^422997661 is an apocalyptic number.

It is an amenable number.

422997661 is a deficient number, since it is larger than the sum of its proper divisors (1).

422997661 is an equidigital number, since it uses as much as digits as its factorization.

422997661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 46.

The square root of 422997661 is about 20566.9069380887. The cubic root of 422997661 is about 750.6646913325.

The spelling of 422997661 in words is "four hundred twenty-two million, nine hundred ninety-seven thousand, six hundred sixty-one".