391129 has 4 divisors (see below), whose sum is σ = 396160. Its totient is φ = 386100.

The previous prime is 391117. The next prime is 391133. The reversal of 391129 is 921193.

391129 is nontrivially palindromic in base 8.

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 a de Polignac number, because none of the positive numbers 2^k-391129 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 (391159) 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, 2397 + ... + 2554.

It is an arithmetic number, because the mean of its divisors is an integer number (99040).

2³⁹¹¹²⁹ is an apocalyptic number.

It is an amenable number.

391129 is a deficient number, since it is larger than the sum of its proper divisors (5031).

391129 is an equidigital number, since it uses as much as digits as its factorization.

391129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5030.

The product of its digits is 486, while the sum is 25.

The square root of 391129 is about 625.4030700276. The cubic root of 391129 is about 73.1318689824.

The spelling of 391129 in words is "three hundred ninety-one thousand, one hundred twenty-nine".