13781031 has 16 divisors (see below), whose sum is σ = 20165760. Its totient is φ = 8301920.

The previous prime is 13780993. The next prime is 13781039. The reversal of 13781031 is 13018731.

13781031 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13781031 - 2⁷ = 13780903 is a prime.

It is a super-2 number, since 2×13781031² = 379833630845922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13780992 and 13781010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13781039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4741 + ... + 7073.

It is an arithmetic number, because the mean of its divisors is an integer number (1260360).

Almost surely, 2^13781031 is an apocalyptic number.

13781031 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13781031 is a deficient number, since it is larger than the sum of its proper divisors (6384729).

13781031 is a wasteful number, since it uses less digits than its factorization.

13781031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2526.

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

The square root of 13781031 is about 3712.2811046579. The cubic root of 13781031 is about 239.7510787206.

Adding to 13781031 its reverse (13018731), we get a palindrome (26799762).

The spelling of 13781031 in words is "thirteen million, seven hundred eighty-one thousand, thirty-one".