391481 has 4 divisors (see below), whose sum is σ = 397392. Its totient is φ = 385572.

The previous prime is 391453. The next prime is 391487. The reversal of 391481 is 184193.

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: 184193 = 47 ⋅3919.

It is a cyclic number.

It is not a de Polignac number, because 391481 - 2¹⁴ = 375097 is a prime.

It is a super-2 number, since 2×391481² = 306514746722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 391481.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 391481.

It is not an unprimeable number, because it can be changed into a prime (391487) 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, 2855 + ... + 2988.

It is an arithmetic number, because the mean of its divisors is an integer number (99348).

2³⁹¹⁴⁸¹ is an apocalyptic number.

It is an amenable number.

391481 is a deficient number, since it is larger than the sum of its proper divisors (5911).

391481 is an equidigital number, since it uses as much as digits as its factorization.

391481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5910.

The product of its digits is 864, while the sum is 26.

The square root of 391481 is about 625.6844252497. The cubic root of 391481 is about 73.1538009617.

The spelling of 391481 in words is "three hundred ninety-one thousand, four hundred eighty-one".