647633453 has 2 divisors, whose sum is σ = 647633454. Its totient is φ = 647633452.

The previous prime is 647633407. The next prime is 647633473. The reversal of 647633453 is 354336746.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 362597764 + 285035689 = 19042^2 + 16883^2 .

It is a cyclic number.

It is not a de Polignac number, because 647633453 - 2²² = 643439149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 647633453.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647633473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323816726 + 323816727.

It is an arithmetic number, because the mean of its divisors is an integer number (323816727).

Almost surely, 2^647633453 is an apocalyptic number.

It is an amenable number.

647633453 is a deficient number, since it is larger than the sum of its proper divisors (1).

647633453 is an equidigital number, since it uses as much as digits as its factorization.

647633453 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 41.

The square root of 647633453 is about 25448.6434412524. The cubic root of 647633453 is about 865.1865471340.

The spelling of 647633453 in words is "six hundred forty-seven million, six hundred thirty-three thousand, four hundred fifty-three".