647503381 has 4 divisors (see below), whose sum is σ = 740003872. Its totient is φ = 555002892.

The previous prime is 647503379. The next prime is 647503393. The reversal of 647503381 is 183305746.

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 647503381 - 2¹ = 647503379 is a prime.

It is a super-2 number, since 2×647503381² = 838521256812862322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 647503381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647503301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46250235 + ... + 46250248.

It is an arithmetic number, because the mean of its divisors is an integer number (185000968).

Almost surely, 2^647503381 is an apocalyptic number.

It is an amenable number.

647503381 is a deficient number, since it is larger than the sum of its proper divisors (92500491).

647503381 is an equidigital number, since it uses as much as digits as its factorization.

647503381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92500490.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 647503381 is about 25446.0877346597. The cubic root of 647503381 is about 865.1286213227.

The spelling of 647503381 in words is "six hundred forty-seven million, five hundred three thousand, three hundred eighty-one".