391448913 has 4 divisors (see below), whose sum is σ = 521931888. Its totient is φ = 260965940.

The previous prime is 391448899. The next prime is 391448923. The reversal of 391448913 is 319844193.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 319844193 = 3 ⋅106614731.

It is a cyclic number.

It is not a de Polignac number, because 391448913 - 2¹⁴ = 391432529 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (391448923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65241483 + ... + 65241488.

It is an arithmetic number, because the mean of its divisors is an integer number (130482972).

Almost surely, 2^391448913 is an apocalyptic number.

It is an amenable number.

391448913 is a deficient number, since it is larger than the sum of its proper divisors (130482975).

391448913 is a wasteful number, since it uses less digits than its factorization.

391448913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130482974.

The product of its digits is 93312, while the sum is 42.

The square root of 391448913 is about 19785.0679301336. The cubic root of 391448913 is about 731.5180226943.

The spelling of 391448913 in words is "three hundred ninety-one million, four hundred forty-eight thousand, nine hundred thirteen".