649049143 has 4 divisors (see below), whose sum is σ = 656341920. Its totient is φ = 641756368.

The previous prime is 649049123. The next prime is 649049161. The reversal of 649049143 is 341940946.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649049143 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 649049096 and 649049105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649049113) 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, 3646255 + ... + 3646432.

It is an arithmetic number, because the mean of its divisors is an integer number (164085480).

Almost surely, 2^649049143 is an apocalyptic number.

649049143 is a deficient number, since it is larger than the sum of its proper divisors (7292777).

649049143 is an equidigital number, since it uses as much as digits as its factorization.

649049143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7292776.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 649049143 is about 25476.4429031998. The cubic root of 649049143 is about 865.8165045816.

It can be divided in two parts, 64904 and 9143, that added together give a palindrome (74047).

The spelling of 649049143 in words is "six hundred forty-nine million, forty-nine thousand, one hundred forty-three".