647693243 has 2 divisors, whose sum is σ = 647693244. Its totient is φ = 647693242.

The previous prime is 647693173. The next prime is 647693273. The reversal of 647693243 is 342396746.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647693243 - 2⁸ = 647692987 is a prime.

It is a Chen prime.

It is equal to p_33679754 and since 647693243 and 33679754 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 647693194 and 647693203.

It is not a weakly prime, because it can be changed into another prime (647693273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323846621 + 323846622.

It is an arithmetic number, because the mean of its divisors is an integer number (323846622).

Almost surely, 2^647693243 is an apocalyptic number.

647693243 is the 13604-th centered heptagonal number.

647693243 is a deficient number, since it is larger than the sum of its proper divisors (1).

647693243 is an equidigital number, since it uses as much as digits as its factorization.

647693243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 44.

The square root of 647693243 is about 25449.8181329455. The cubic root of 647693243 is about 865.2131712023.

The spelling of 647693243 in words is "six hundred forty-seven million, six hundred ninety-three thousand, two hundred forty-three".