647337161 has 4 divisors (see below), whose sum is σ = 652434432. Its totient is φ = 642239892.

The previous prime is 647337137. The next prime is 647337191. The reversal of 647337161 is 161733746.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 647337161 - 2¹⁴ = 647320777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647337191) 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, 2548445 + ... + 2548698.

It is an arithmetic number, because the mean of its divisors is an integer number (163108608).

Almost surely, 2^647337161 is an apocalyptic number.

It is an amenable number.

647337161 is a deficient number, since it is larger than the sum of its proper divisors (5097271).

647337161 is a wasteful number, since it uses less digits than its factorization.

647337161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5097270.

The product of its digits is 63504, while the sum is 38.

The square root of 647337161 is about 25442.8214040817. The cubic root of 647337161 is about 865.0545861952.

It can be divided in two parts, 6473 and 37161, that added together give a palindrome (43634).

The spelling of 647337161 in words is "six hundred forty-seven million, three hundred thirty-seven thousand, one hundred sixty-one".