391541 has 4 divisors (see below), whose sum is σ = 394752. Its totient is φ = 388332.

The previous prime is 391537. The next prime is 391553. The reversal of 391541 is 145193.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 391541 - 2² = 391537 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391441) 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, 1415 + ... + 1668.

It is an arithmetic number, because the mean of its divisors is an integer number (98688).

2³⁹¹⁵⁴¹ is an apocalyptic number.

It is an amenable number.

391541 is a deficient number, since it is larger than the sum of its proper divisors (3211).

391541 is a wasteful number, since it uses less digits than its factorization.

391541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3210.

The product of its digits is 540, while the sum is 23.

The square root of 391541 is about 625.7323709063. The cubic root of 391541 is about 73.1575380557.

The spelling of 391541 in words is "three hundred ninety-one thousand, five hundred forty-one".