391641266 has 8 divisors (see below), whose sum is σ = 601790364. Its totient is φ = 191044480.

The previous prime is 391641253. The next prime is 391641269. The reversal of 391641266 is 662146193.

It can be written as a sum of positive squares in 2 ways, for example, as 340218025 + 51423241 = 18445^2 + 7171^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (391641269) 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, 2387975 + ... + 2388138.

Almost surely, 2^391641266 is an apocalyptic number.

391641266 is a deficient number, since it is larger than the sum of its proper divisors (210149098).

391641266 is a wasteful number, since it uses less digits than its factorization.

391641266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4776156.

The product of its digits is 46656, while the sum is 38.

The square root of 391641266 is about 19789.9283980514. The cubic root of 391641266 is about 731.6378226139.

The spelling of 391641266 in words is "three hundred ninety-one million, six hundred forty-one thousand, two hundred sixty-six".