649432253 has 4 divisors (see below), whose sum is σ = 650879100. Its totient is φ = 647985408.

The previous prime is 649432211. The next prime is 649432271. The reversal of 649432253 is 352234946.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 468852409 + 180579844 = 21653^2 + 13438^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649432253 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 (649431253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 722750 + ... + 723647.

It is an arithmetic number, because the mean of its divisors is an integer number (162719775).

Almost surely, 2^649432253 is an apocalyptic number.

It is an amenable number.

649432253 is a deficient number, since it is larger than the sum of its proper divisors (1446847).

649432253 is a wasteful number, since it uses less digits than its factorization.

649432253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1446846.

The product of its digits is 155520, while the sum is 38.

The square root of 649432253 is about 25483.9607008016. The cubic root of 649432253 is about 865.9868243599.

The spelling of 649432253 in words is "six hundred forty-nine million, four hundred thirty-two thousand, two hundred fifty-three".