612113721 has 4 divisors (see below), whose sum is σ = 816151632. Its totient is φ = 408075812.

The previous prime is 612113639. The next prime is 612113741. The reversal of 612113721 is 127311216.

612113721 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 612113721 - 2⁹ = 612113209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 612113691 and 612113700.

It is not an unprimeable number, because it can be changed into a prime (612113741) 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, 102018951 + ... + 102018956.

It is an arithmetic number, because the mean of its divisors is an integer number (204037908).

Almost surely, 2^612113721 is an apocalyptic number.

It is an amenable number.

612113721 is a deficient number, since it is larger than the sum of its proper divisors (204037911).

612113721 is a wasteful number, since it uses less digits than its factorization.

612113721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204037910.

The product of its digits is 504, while the sum is 24.

The square root of 612113721 is about 24740.9320964268. The cubic root of 612113721 is about 849.0710594365.

Adding to 612113721 its reverse (127311216), we get a palindrome (739424937).

The spelling of 612113721 in words is "six hundred twelve million, one hundred thirteen thousand, seven hundred twenty-one".