617721413 has 4 divisors (see below), whose sum is σ = 629376588. Its totient is φ = 606066240.

The previous prime is 617721409. The next prime is 617721427. The reversal of 617721413 is 314127716.

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 206726884 + 410994529 = 14378^2 + 20273^2 .

It is a cyclic number.

It is not a de Polignac number, because 617721413 - 2² = 617721409 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 617721413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (617721493) 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, 5827508 + ... + 5827613.

It is an arithmetic number, because the mean of its divisors is an integer number (157344147).

Almost surely, 2^617721413 is an apocalyptic number.

It is an amenable number.

617721413 is a deficient number, since it is larger than the sum of its proper divisors (11655175).

617721413 is a wasteful number, since it uses less digits than its factorization.

617721413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11655174.

The product of its digits is 7056, while the sum is 32.

The square root of 617721413 is about 24854.0019513961. The cubic root of 617721413 is about 851.6560163156.

The spelling of 617721413 in words is "six hundred seventeen million, seven hundred twenty-one thousand, four hundred thirteen".