391276671 has 16 divisors (see below), whose sum is σ = 568099200. Its totient is φ = 238599648.

The previous prime is 391276657. The next prime is 391276673. The reversal of 391276671 is 176672193.

It is not a de Polignac number, because 391276671 - 2¹⁵ = 391243903 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391276673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116701 + ... + 120006.

It is an arithmetic number, because the mean of its divisors is an integer number (35506200).

Almost surely, 2^391276671 is an apocalyptic number.

391276671 is a deficient number, since it is larger than the sum of its proper divisors (176822529).

391276671 is a wasteful number, since it uses less digits than its factorization.

391276671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236758.

The product of its digits is 95256, while the sum is 42.

The square root of 391276671 is about 19780.7146230868. The cubic root of 391276671 is about 731.4107148543.

The spelling of 391276671 in words is "three hundred ninety-one million, two hundred seventy-six thousand, six hundred seventy-one".