642227017 has 2 divisors, whose sum is σ = 642227018. Its totient is φ = 642227016.

The previous prime is 642226979. The next prime is 642227083. The reversal of 642227017 is 710722246.

642227017 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 467035321 + 175191696 = 21611^2 + 13236^2 .

It is a cyclic number.

It is not a de Polignac number, because 642227017 - 2⁷ = 642226889 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 642227017.

It is not a weakly prime, because it can be changed into another prime (642227087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321113508 + 321113509.

It is an arithmetic number, because the mean of its divisors is an integer number (321113509).

Almost surely, 2^642227017 is an apocalyptic number.

It is an amenable number.

642227017 is a deficient number, since it is larger than the sum of its proper divisors (1).

642227017 is an equidigital number, since it uses as much as digits as its factorization.

642227017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 642227017 is about 25342.1983458421. The cubic root of 642227017 is about 862.7722943949.

The spelling of 642227017 in words is "six hundred forty-two million, two hundred twenty-seven thousand, seventeen".