642206319 has 4 divisors (see below), whose sum is σ = 856275096. Its totient is φ = 428137544.

The previous prime is 642206293. The next prime is 642206321. The reversal of 642206319 is 913602246.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 642206319 - 2⁸ = 642206063 is a prime.

It is a super-2 number, since 2×642206319² = 824857912327059522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 642206319.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642206219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107034384 + ... + 107034389.

It is an arithmetic number, because the mean of its divisors is an integer number (214068774).

Almost surely, 2^642206319 is an apocalyptic number.

642206319 is a deficient number, since it is larger than the sum of its proper divisors (214068777).

642206319 is a wasteful number, since it uses less digits than its factorization.

642206319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214068776.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 642206319 is about 25341.7899722967. The cubic root of 642206319 is about 862.7630256824.

The spelling of 642206319 in words is "six hundred forty-two million, two hundred six thousand, three hundred nineteen".