649143633 has 4 divisors (see below), whose sum is σ = 865524848. Its totient is φ = 432762420.

The previous prime is 649143617. The next prime is 649143647. The reversal of 649143633 is 336341946.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 649143633 - 2⁴ = 649143617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 649143591 and 649143600.

It is not an unprimeable number, because it can be changed into a prime (649143653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108190603 + ... + 108190608.

It is an arithmetic number, because the mean of its divisors is an integer number (216381212).

Almost surely, 2^649143633 is an apocalyptic number.

It is an amenable number.

649143633 is a deficient number, since it is larger than the sum of its proper divisors (216381215).

649143633 is a wasteful number, since it uses less digits than its factorization.

649143633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216381214.

The product of its digits is 139968, while the sum is 39.

The square root of 649143633 is about 25478.2972939716. The cubic root of 649143633 is about 865.8585183658.

The spelling of 649143633 in words is "six hundred forty-nine million, one hundred forty-three thousand, six hundred thirty-three".