612318643 has 4 divisors (see below), whose sum is σ = 644545960. Its totient is φ = 580091328.

The previous prime is 612318617. The next prime is 612318649. The reversal of 612318643 is 346813216.

It is a happy number.

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 612318643 - 2¹⁷ = 612187571 is a prime.

It is a super-2 number, since 2×612318643² = 749868241130722898, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 612318599 and 612318608.

It is not an unprimeable number, because it can be changed into a prime (612318649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16113630 + ... + 16113667.

It is an arithmetic number, because the mean of its divisors is an integer number (161136490).

Almost surely, 2^612318643 is an apocalyptic number.

612318643 is a deficient number, since it is larger than the sum of its proper divisors (32227317).

612318643 is a wasteful number, since it uses less digits than its factorization.

612318643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32227316.

The product of its digits is 20736, while the sum is 34.

The square root of 612318643 is about 24745.0731055699. The cubic root of 612318643 is about 849.1657988730.

The spelling of 612318643 in words is "six hundred twelve million, three hundred eighteen thousand, six hundred forty-three".