642317 has 4 divisors (see below), whose sum is σ = 691740. Its totient is φ = 592896.

The previous prime is 642281. The next prime is 642359. The reversal of 642317 is 713246.

642317 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 164836 + 477481 = 406^2 + 691^2 .

It is a cyclic number.

It is not a de Polignac number, because 642317 - 2⁶ = 642253 is a prime.

It is a super-2 number, since 2×642317² = 825142256978, which contains 22 as substring.

It is a d-powerful number, because it can be written as 6⁷ + 4⁸ + 3¹¹ + 2¹¹ + 1 + 7⁶ .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642292 and 642301.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 642317.

It is not an unprimeable number, because it can be changed into a prime (642217) 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, 24692 + ... + 24717.

It is an arithmetic number, because the mean of its divisors is an integer number (172935).

2⁶⁴²³¹⁷ is an apocalyptic number.

It is an amenable number.

642317 is a deficient number, since it is larger than the sum of its proper divisors (49423).

642317 is a wasteful number, since it uses less digits than its factorization.

642317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49422.

The product of its digits is 1008, while the sum is 23.

The square root of 642317 is about 801.4468167009. The cubic root of 642317 is about 86.2812587112.

It can be divided in two parts, 642 and 317, that added together give a palindrome (959).

The spelling of 642317 in words is "six hundred forty-two thousand, three hundred seventeen".