1313181 has 12 divisors (see below), whose sum is σ = 1933308. Its totient is φ = 858624.

The previous prime is 1313171. The next prime is 1313219. The reversal of 1313181 is 1813131.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1102500 + 210681 = 1050^2 + 459^2 .

It is not a de Polignac number, because 1313181 - 2⁹ = 1312669 is a prime.

It is a super-2 number, since 2×1313181² = 3448888677522, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 900 + ... + 1853.

It is an arithmetic number, because the mean of its divisors is an integer number (161109).

2^1313181 is an apocalyptic number.

It is an amenable number.

1313181 is a deficient number, since it is larger than the sum of its proper divisors (620127).

1313181 is a wasteful number, since it uses less digits than its factorization.

1313181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2812 (or 2809 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

The square root of 1313181 is about 1145.9410979627. The cubic root of 1313181 is about 109.5069114296.

It can be divided in two parts, 13131 and 81, that multiplied together give a triangular number (1063611 = T₁₄₅₈).

The spelling of 1313181 in words is "one million, three hundred thirteen thousand, one hundred eighty-one".