13489132781 has 2 divisors, whose sum is σ = 13489132782. Its totient is φ = 13489132780.

The previous prime is 13489132763. The next prime is 13489132801. The reversal of 13489132781 is 18723198431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7696552900 + 5792579881 = 87730^2 + 76109^2 .

It is a cyclic number.

It is not a de Polignac number, because 13489132781 - 2²² = 13484938477 is a prime.

It is a super-2 number, since 2×13489132781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13489131781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6744566390 + 6744566391.

It is an arithmetic number, because the mean of its divisors is an integer number (6744566391).

Almost surely, 2^13489132781 is an apocalyptic number.

It is an amenable number.

13489132781 is a deficient number, since it is larger than the sum of its proper divisors (1).

13489132781 is an equidigital number, since it uses as much as digits as its factorization.

13489132781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 47.

The spelling of 13489132781 in words is "thirteen billion, four hundred eighty-nine million, one hundred thirty-two thousand, seven hundred eighty-one".