649749273 has 4 divisors (see below), whose sum is σ = 866332368. Its totient is φ = 433166180.

The previous prime is 649749271. The next prime is 649749281. The reversal of 649749273 is 372947946.

649749273 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 649749273 - 2¹ = 649749271 is a prime.

It is not an unprimeable number, because it can be changed into a prime (649749271) 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, 108291543 + ... + 108291548.

It is an arithmetic number, because the mean of its divisors is an integer number (216583092).

Almost surely, 2^649749273 is an apocalyptic number.

It is an amenable number.

649749273 is a deficient number, since it is larger than the sum of its proper divisors (216583095).

649749273 is a wasteful number, since it uses less digits than its factorization.

649749273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216583094.

The product of its digits is 2286144, while the sum is 51.

The square root of 649749273 is about 25490.1799326721. The cubic root of 649749273 is about 866.1277117697.

It can be divided in two parts, 64974 and 9273, that added together give a palindrome (74247).

The spelling of 649749273 in words is "six hundred forty-nine million, seven hundred forty-nine thousand, two hundred seventy-three".