647311351 has 4 divisors (see below), whose sum is σ = 648291304. Its totient is φ = 646331400.

The previous prime is 647311339. The next prime is 647311387. The reversal of 647311351 is 153113746.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647311351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647311391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 488985 + ... + 490306.

It is an arithmetic number, because the mean of its divisors is an integer number (162072826).

Almost surely, 2^647311351 is an apocalyptic number.

647311351 is a deficient number, since it is larger than the sum of its proper divisors (979953).

647311351 is an equidigital number, since it uses as much as digits as its factorization.

647311351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979952.

The product of its digits is 7560, while the sum is 31.

The square root of 647311351 is about 25442.3141832656. The cubic root of 647311351 is about 865.0430891696.

The spelling of 647311351 in words is "six hundred forty-seven million, three hundred eleven thousand, three hundred fifty-one".