617379821 has 2 divisors, whose sum is σ = 617379822. Its totient is φ = 617379820.

The previous prime is 617379799. The next prime is 617379883. The reversal of 617379821 is 128973716.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 367297225 + 250082596 = 19165^2 + 15814^2 .

It is a cyclic number.

It is not a de Polignac number, because 617379821 - 2⁶ = 617379757 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (617309821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308689910 + 308689911.

It is an arithmetic number, because the mean of its divisors is an integer number (308689911).

Almost surely, 2^617379821 is an apocalyptic number.

It is an amenable number.

617379821 is a deficient number, since it is larger than the sum of its proper divisors (1).

617379821 is an equidigital number, since it uses as much as digits as its factorization.

617379821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 44.

The square root of 617379821 is about 24847.1290293265. The cubic root of 617379821 is about 851.4990024270.

The spelling of 617379821 in words is "six hundred seventeen million, three hundred seventy-nine thousand, eight hundred twenty-one".