648199843 has 4 divisors (see below), whose sum is σ = 651030640. Its totient is φ = 645369048.

The previous prime is 648199837. The next prime is 648199859. The reversal of 648199843 is 348991846.

It is a happy number.

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-648199843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648199813) 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, 1415055 + ... + 1415512.

It is an arithmetic number, because the mean of its divisors is an integer number (162757660).

Almost surely, 2^648199843 is an apocalyptic number.

648199843 is a deficient number, since it is larger than the sum of its proper divisors (2830797).

648199843 is a wasteful number, since it uses less digits than its factorization.

648199843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2830796.

The product of its digits is 1492992, while the sum is 52.

The square root of 648199843 is about 25459.7691073584. The cubic root of 648199843 is about 865.4386909056.

The spelling of 648199843 in words is "six hundred forty-eight million, one hundred ninety-nine thousand, eight hundred forty-three".