642313547 has 4 divisors (see below), whose sum is σ = 664462320. Its totient is φ = 620164776.

The previous prime is 642313543. The next prime is 642313561. The reversal of 642313547 is 745313246.

642313547 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, and also an emirpimes, since its reverse is a distinct semiprime: 745313246 = 2 ⋅372656623.

It is a cyclic number.

It is not a de Polignac number, because 642313547 - 2² = 642313543 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642313543) 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, 11074343 + ... + 11074400.

It is an arithmetic number, because the mean of its divisors is an integer number (166115580).

Almost surely, 2^642313547 is an apocalyptic number.

642313547 is a deficient number, since it is larger than the sum of its proper divisors (22148773).

642313547 is a wasteful number, since it uses less digits than its factorization.

642313547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22148772.

The product of its digits is 60480, while the sum is 35.

The square root of 642313547 is about 25343.9055198681. The cubic root of 642313547 is about 862.8110409918.

The spelling of 642313547 in words is "six hundred forty-two million, three hundred thirteen thousand, five hundred forty-seven".