1317381 has 16 divisors (see below), whose sum is σ = 2003904. Its totient is φ = 762624.

The previous prime is 1317377. The next prime is 1317397. The reversal of 1317381 is 1837131.

It is not a de Polignac number, because 1317381 - 2² = 1317377 is a prime.

It is a super-2 number, since 2×1317381² = 3470985398322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1317301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 331 + ... + 1656.

It is an arithmetic number, because the mean of its divisors is an integer number (125244).

2^1317381 is an apocalyptic number.

1317381 is the 663-rd octagonal number.

It is an amenable number.

1317381 is a deficient number, since it is larger than the sum of its proper divisors (686523).

1317381 is a wasteful number, since it uses less digits than its factorization.

1317381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2020.

The product of its digits is 504, while the sum is 24.

The square root of 1317381 is about 1147.7721899401. The cubic root of 1317381 is about 109.6235339823.

The spelling of 1317381 in words is "one million, three hundred seventeen thousand, three hundred eighty-one".