649179442 has 32 divisors (see below), whose sum is σ = 1069452720. Its totient is φ = 294174720.

The previous prime is 649179373. The next prime is 649179449. The reversal of 649179442 is 244971946.

It is a Cunningham number, because it is equal to 25479²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 340439401 + 308740041 = 18451^2 + 17571^2 .

It is a junction number, because it is equal to n+sod(n) for n = 649179392 and 649179401.

It is not an unprimeable number, because it can be changed into a prime (649179449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 532818 + ... + 534034.

Almost surely, 2^649179442 is an apocalyptic number.

649179442 is a deficient number, since it is larger than the sum of its proper divisors (420273278).

649179442 is a wasteful number, since it uses less digits than its factorization.

649179442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1806.

The product of its digits is 435456, while the sum is 46.

The square root of 649179442 is about 25479.0000196240. Note that the first 4 decimals coincide. The cubic root of 649179442 is about 865.8744393197.

The spelling of 649179442 in words is "six hundred forty-nine million, one hundred seventy-nine thousand, four hundred forty-two".