1391331 has 8 divisors (see below), whose sum is σ = 1964304. Its totient is φ = 872960.

The previous prime is 1391323. The next prime is 1391353. The reversal of 1391331 is 1331931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1391331 - 2³ = 1391323 is a prime.

It is a super-2 number, since 2×1391331² = 3871603903122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1391298 and 1391307.

It is not an unprimeable number, because it can be changed into a prime (1391381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13590 + ... + 13691.

It is an arithmetic number, because the mean of its divisors is an integer number (245538).

2^1391331 is an apocalyptic number.

1391331 is a deficient number, since it is larger than the sum of its proper divisors (572973).

1391331 is a wasteful number, since it uses less digits than its factorization.

1391331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27301.

The product of its digits is 243, while the sum is 21.

The square root of 1391331 is about 1179.5469469250. The cubic root of 1391331 is about 111.6375132429.

The spelling of 1391331 in words is "one million, three hundred ninety-one thousand, three hundred thirty-one".