617991213 has 8 divisors (see below), whose sum is σ = 941700928. Its totient is φ = 353137824.

The previous prime is 617991197. The next prime is 617991263. The reversal of 617991213 is 312199716.

It is a happy number.

617991213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 617991213 - 2⁴ = 617991197 is a prime.

It is a super-2 number, since 2×617991213² = 763826278690422738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (617991263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14714056 + ... + 14714097.

It is an arithmetic number, because the mean of its divisors is an integer number (117712616).

Almost surely, 2^617991213 is an apocalyptic number.

It is an amenable number.

617991213 is a deficient number, since it is larger than the sum of its proper divisors (323709715).

617991213 is a wasteful number, since it uses less digits than its factorization.

617991213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29428163.

The product of its digits is 20412, while the sum is 39.

The square root of 617991213 is about 24859.4290561952. The cubic root of 617991213 is about 851.7799898650.

The spelling of 617991213 in words is "six hundred seventeen million, nine hundred ninety-one thousand, two hundred thirteen".