617640271 has 2 divisors, whose sum is σ = 617640272. Its totient is φ = 617640270.

The previous prime is 617640269. The next prime is 617640319. The reversal of 617640271 is 172046716.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 617640271 - 2¹ = 617640269 is a prime.

It is a super-3 number, since 3×617640271³ (a number of 27 digits) contains 333 as substring.

Together with 617640269, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (617640071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308820135 + 308820136.

It is an arithmetic number, because the mean of its divisors is an integer number (308820136).

Almost surely, 2^617640271 is an apocalyptic number.

617640271 is a deficient number, since it is larger than the sum of its proper divisors (1).

617640271 is an equidigital number, since it uses as much as digits as its factorization.

617640271 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 617640271 is about 24852.3695248562. The cubic root of 617640271 is about 851.6187243708.

Adding to 617640271 its reverse (172046716), we get a palindrome (789686987).

The spelling of 617640271 in words is "six hundred seventeen million, six hundred forty thousand, two hundred seventy-one".