13781129 has 2 divisors, whose sum is σ = 13781130. Its totient is φ = 13781128.

The previous prime is 13781123. The next prime is 13781149. The reversal of 13781129 is 92118731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10725625 + 3055504 = 3275^2 + 1748^2 .

It is a cyclic number.

It is not a de Polignac number, because 13781129 - 2⁸ = 13780873 is a prime.

It is a nialpdrome in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 13781095 and 13781104.

It is not a weakly prime, because it can be changed into another prime (13781123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6890564 + 6890565.

It is an arithmetic number, because the mean of its divisors is an integer number (6890565).

Almost surely, 2^13781129 is an apocalyptic number.

It is an amenable number.

13781129 is a deficient number, since it is larger than the sum of its proper divisors (1).

13781129 is an equidigital number, since it uses as much as digits as its factorization.

13781129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 32.

The square root of 13781129 is about 3712.2943040659. The cubic root of 13781129 is about 239.7516470272.

The spelling of 13781129 in words is "thirteen million, seven hundred eighty-one thousand, one hundred twenty-nine".