647055493 has 4 divisors (see below), whose sum is σ = 739492000. Its totient is φ = 554618988.

The previous prime is 647055491. The next prime is 647055499. The reversal of 647055493 is 394550746.

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, and also an emirpimes, since its reverse is a distinct semiprime: 394550746 = 2 ⋅197275373.

It is not a de Polignac number, because 647055493 - 2¹ = 647055491 is a prime.

It is a super-2 number, since 2×647055493² = 837361622042946098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647055491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46218243 + ... + 46218256.

It is an arithmetic number, because the mean of its divisors is an integer number (184873000).

Almost surely, 2^647055493 is an apocalyptic number.

It is an amenable number.

647055493 is a deficient number, since it is larger than the sum of its proper divisors (92436507).

647055493 is an equidigital number, since it uses as much as digits as its factorization.

647055493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92436506.

The product of its (nonzero) digits is 453600, while the sum is 43.

The square root of 647055493 is about 25437.2854880390. The cubic root of 647055493 is about 864.9291010753.

The spelling of 647055493 in words is "six hundred forty-seven million, fifty-five thousand, four hundred ninety-three".