13031381 has 4 divisors (see below), whose sum is σ = 14216064. Its totient is φ = 11846700.

The previous prime is 13031351. The next prime is 13031383. The reversal of 13031381 is 18313031.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18313031 = 11 ⋅1664821.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13031381 is a prime.

It is a super-2 number, since 2×13031381² = 339633781534322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13031383) 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, 592325 + ... + 592346.

It is an arithmetic number, because the mean of its divisors is an integer number (3554016).

Almost surely, 2^13031381 is an apocalyptic number.

13031381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13031381 is a deficient number, since it is larger than the sum of its proper divisors (1184683).

13031381 is a wasteful number, since it uses less digits than its factorization.

13031381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1184682.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 13031381 is about 3609.9004141389. The cubic root of 13031381 is about 235.3225147749.

The spelling of 13031381 in words is "thirteen million, thirty-one thousand, three hundred eighty-one".