649293143 has 4 divisors (see below), whose sum is σ = 650695968. Its totient is φ = 647890320.

The previous prime is 649293133. The next prime is 649293157. The reversal of 649293143 is 341392946.

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

It is a cyclic number.

It is not a de Polignac number, because 649293143 - 2¹⁸ = 649030999 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 649293143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649293133) 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, 700718 + ... + 701643.

It is an arithmetic number, because the mean of its divisors is an integer number (162673992).

Almost surely, 2^649293143 is an apocalyptic number.

649293143 is a deficient number, since it is larger than the sum of its proper divisors (1402825).

649293143 is a wasteful number, since it uses less digits than its factorization.

649293143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1402824.

The product of its digits is 139968, while the sum is 41.

The square root of 649293143 is about 25481.2311908196. The cubic root of 649293143 is about 865.9249877690.

The spelling of 649293143 in words is "six hundred forty-nine million, two hundred ninety-three thousand, one hundred forty-three".