647094249 has 6 divisors (see below), whose sum is σ = 934691706. Its totient is φ = 431396160.

The previous prime is 647094247. The next prime is 647094271. The reversal of 647094249 is 942490746.

It can be written as a sum of positive squares in only one way, i.e., 330076224 + 317018025 = 18168^2 + 17805^2 .

It is not a de Polignac number, because 647094249 - 2¹ = 647094247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (647094247) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35949672 + ... + 35949689.

It is an arithmetic number, because the mean of its divisors is an integer number (155781951).

Almost surely, 2^647094249 is an apocalyptic number.

It is an amenable number.

647094249 is a deficient number, since it is larger than the sum of its proper divisors (287597457).

647094249 is a wasteful number, since it uses less digits than its factorization.

647094249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71899367 (or 71899364 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The square root of 647094249 is about 25438.0472717542. The cubic root of 647094249 is about 864.9463693124.

The spelling of 647094249 in words is "six hundred forty-seven million, ninety-four thousand, two hundred forty-nine".