647469949 has 4 divisors (see below), whose sum is σ = 739965664. Its totient is φ = 554974236.

The previous prime is 647469931. The next prime is 647469959. The reversal of 647469949 is 949964746.

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 647469949 - 2⁵ = 647469917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 647469893 and 647469902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647469929) 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, 46247847 + ... + 46247860.

It is an arithmetic number, because the mean of its divisors is an integer number (184991416).

Almost surely, 2^647469949 is an apocalyptic number.

It is an amenable number.

647469949 is a deficient number, since it is larger than the sum of its proper divisors (92495715).

647469949 is an equidigital number, since it uses as much as digits as its factorization.

647469949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92495714.

The product of its digits is 11757312, while the sum is 58.

The square root of 647469949 is about 25445.4308079073. The cubic root of 647469949 is about 865.1137315792.

It can be divided in two parts, 647 and 469949, that added together give a square (470596 = 686²).

The spelling of 647469949 in words is "six hundred forty-seven million, four hundred sixty-nine thousand, nine hundred forty-nine".