391048471 has 4 divisors (see below), whose sum is σ = 426598344. Its totient is φ = 355498600.

The previous prime is 391048457. The next prime is 391048487. The reversal of 391048471 is 174840193.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 391048471 - 2⁹ = 391047959 is a prime.

It is a super-3 number, since 3×391048471³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 391048471.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391048451) 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, 17774920 + ... + 17774941.

It is an arithmetic number, because the mean of its divisors is an integer number (106649586).

Almost surely, 2^391048471 is an apocalyptic number.

391048471 is a deficient number, since it is larger than the sum of its proper divisors (35549873).

391048471 is a wasteful number, since it uses less digits than its factorization.

391048471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35549872.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 391048471 is about 19774.9455372196. The cubic root of 391048471 is about 731.2684963203.

The spelling of 391048471 in words is "three hundred ninety-one million, forty-eight thousand, four hundred seventy-one".