1317931 has 4 divisors (see below), whose sum is σ = 1322872. Its totient is φ = 1312992.

The previous prime is 1317929. The next prime is 1317941. The reversal of 1317931 is 1397131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1317931 - 2¹ = 1317929 is a prime.

It is a super-2 number, since 2×1317931² = 3473884241522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1317896 and 1317905.

It is not an unprimeable number, because it can be changed into a prime (1317941) 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, 2046 + ... + 2611.

It is an arithmetic number, because the mean of its divisors is an integer number (330718).

2^1317931 is an apocalyptic number.

1317931 is a deficient number, since it is larger than the sum of its proper divisors (4941).

1317931 is an equidigital number, since it uses as much as digits as its factorization.

1317931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4940.

The product of its digits is 567, while the sum is 25.

The square root of 1317931 is about 1148.0117595217. The cubic root of 1317931 is about 109.6387876193.

It can be divided in two parts, 131 and 7931, that multiplied together give a triangular number (1038961 = T₁₄₄₁).

The spelling of 1317931 in words is "one million, three hundred seventeen thousand, nine hundred thirty-one".