649344247 has 16 divisors (see below), whose sum is σ = 701176960. Its totient is φ = 599350752.

The previous prime is 649344233. The next prime is 649344253. The reversal of 649344247 is 742443946.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649344247 is a prime.

It is a super-2 number, since 2×649344247² = 843295902223994018, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649344277) 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 15 ways as a sum of consecutive naturals, for example, 446173 + ... + 447625.

It is an arithmetic number, because the mean of its divisors is an integer number (43823560).

Almost surely, 2^649344247 is an apocalyptic number.

649344247 is a deficient number, since it is larger than the sum of its proper divisors (51832713).

649344247 is a wasteful number, since it uses less digits than its factorization.

649344247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2062.

The product of its digits is 580608, while the sum is 43.

The square root of 649344247 is about 25482.2339483806. The cubic root of 649344247 is about 865.9477053300.

The spelling of 649344247 in words is "six hundred forty-nine million, three hundred forty-four thousand, two hundred forty-seven".