20131129 has 2 divisors, whose sum is σ = 20131130. Its totient is φ = 20131128.

The previous prime is 20131117. The next prime is 20131147. The reversal of 20131129 is 92113102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19184400 + 946729 = 4380^2 + 973^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20131129 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20131109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10065564 + 10065565.

It is an arithmetic number, because the mean of its divisors is an integer number (10065565).

Almost surely, 2^20131129 is an apocalyptic number.

It is an amenable number.

20131129 is a deficient number, since it is larger than the sum of its proper divisors (1).

20131129 is an equidigital number, since it uses as much as digits as its factorization.

20131129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 20131129 is about 4486.7726708627. The cubic root of 20131129 is about 272.0337013100.

The spelling of 20131129 in words is "twenty million, one hundred thirty-one thousand, one hundred twenty-nine".