13430723881 has 3 divisors (see below), whose sum is σ = 13430839773. Its totient is φ = 13430607990.

The previous prime is 13430723849. The next prime is 13430723903. The reversal of 13430723881 is 18832703431.

It is a happy number.

The square root of 13430723881 is 115891.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 13430723881 - 2⁵ = 13430723849 is a prime.

It is a super-2 number, since 2×13430723881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13430723381) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 57946 + ... + 173836.

It is an arithmetic number, because the mean of its divisors is an integer number (4476946591).

Almost surely, 2^13430723881 is an apocalyptic number.

13430723881 is the 115891-st square number.

13430723881 is the 57946-th centered octagonal number.

It is an amenable number.

13430723881 is a deficient number, since it is larger than the sum of its proper divisors (115892).

13430723881 is an frugal number, since it uses more digits than its factorization.

13430723881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231782 (or 115891 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The spelling of 13430723881 in words is "thirteen billion, four hundred thirty million, seven hundred twenty-three thousand, eight hundred eighty-one".