649697543 has 8 divisors (see below), whose sum is σ = 711029136. Its totient is φ = 588744000.

The previous prime is 649697539. The next prime is 649697567. The reversal of 649697543 is 345796946.

649697543 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 649697543 - 2² = 649697539 is a prime.

It is a super-3 number, since 3×649697543³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649697743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90908 + ... + 97793.

It is an arithmetic number, because the mean of its divisors is an integer number (88878642).

Almost surely, 2^649697543 is an apocalyptic number.

649697543 is a deficient number, since it is larger than the sum of its proper divisors (61331593).

649697543 is a wasteful number, since it uses less digits than its factorization.

649697543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189025.

The product of its digits is 4898880, while the sum is 53.

The square root of 649697543 is about 25489.1652079859. The cubic root of 649697543 is about 866.1047254797.

The spelling of 649697543 in words is "six hundred forty-nine million, six hundred ninety-seven thousand, five hundred forty-three".