617747421 has 8 divisors (see below), whose sum is σ = 823778080. Its totient is φ = 411774192.

The previous prime is 617747419. The next prime is 617747467. The reversal of 617747421 is 124747716.

617747421 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 617747421 - 2¹ = 617747419 is a prime.

It is a super-2 number, since 2×617747421² = 763223752304302482, which contains 22 as substring.

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 617747421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (617747401) 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, 34410 + ... + 49188.

It is an arithmetic number, because the mean of its divisors is an integer number (102972260).

Almost surely, 2^617747421 is an apocalyptic number.

It is an amenable number.

617747421 is a deficient number, since it is larger than the sum of its proper divisors (206030659).

617747421 is a wasteful number, since it uses less digits than its factorization.

617747421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28715.

The product of its digits is 65856, while the sum is 39.

The square root of 617747421 is about 24854.5251614268. The cubic root of 617747421 is about 851.6679686069.

It can be divided in two parts, 61774 and 7421, that multiplied together give a palindrome (458424854).

The spelling of 617747421 in words is "six hundred seventeen million, seven hundred forty-seven thousand, four hundred twenty-one".