647492093 has 4 divisors (see below), whose sum is σ = 653778528. Its totient is φ = 641205660.

The previous prime is 647492081. The next prime is 647492099. The reversal of 647492093 is 390294746.

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 a de Polignac number, because none of the positive numbers 2^k-647492093 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 (647492099) 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, 3143063 + ... + 3143268.

It is an arithmetic number, because the mean of its divisors is an integer number (163444632).

Almost surely, 2^647492093 is an apocalyptic number.

It is an amenable number.

647492093 is a deficient number, since it is larger than the sum of its proper divisors (6286435).

647492093 is a wasteful number, since it uses less digits than its factorization.

647492093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6286434.

The product of its (nonzero) digits is 326592, while the sum is 44.

The square root of 647492093 is about 25445.8659314239. The cubic root of 647492093 is about 865.1235939984.

The spelling of 647492093 in words is "six hundred forty-seven million, four hundred ninety-two thousand, ninety-three".