13998134981 has 2 divisors, whose sum is σ = 13998134982. Its totient is φ = 13998134980.

The previous prime is 13998134977. The next prime is 13998135049. The reversal of 13998134981 is 18943189931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12771034081 + 1227100900 = 113009^2 + 35030^2 .

It is a cyclic number.

It is not a de Polignac number, because 13998134981 - 2² = 13998134977 is a prime.

It is a super-2 number, since 2×13998134981² (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 (13998134911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6999067490 + 6999067491.

It is an arithmetic number, because the mean of its divisors is an integer number (6999067491).

Almost surely, 2^13998134981 is an apocalyptic number.

It is an amenable number.

13998134981 is a deficient number, since it is larger than the sum of its proper divisors (1).

13998134981 is an equidigital number, since it uses as much as digits as its factorization.

13998134981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1679616, while the sum is 56.

The spelling of 13998134981 in words is "thirteen billion, nine hundred ninety-eight million, one hundred thirty-four thousand, nine hundred eighty-one".