13511723938 has 4 divisors (see below), whose sum is σ = 20267585910. Its totient is φ = 6755861968.

The previous prime is 13511723923. The next prime is 13511723971. The reversal of 13511723938 is 83932711531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12237448129 + 1274275809 = 110623^2 + 35697^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13511723894 and 13511723903.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3377930983 + ... + 3377930986.

Almost surely, 2^13511723938 is an apocalyptic number.

13511723938 is a deficient number, since it is larger than the sum of its proper divisors (6755861972).

13511723938 is an equidigital number, since it uses as much as digits as its factorization.

13511723938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6755861971.

The product of its digits is 136080, while the sum is 43.

The spelling of 13511723938 in words is "thirteen billion, five hundred eleven million, seven hundred twenty-three thousand, nine hundred thirty-eight".