13131951905 has 8 divisors (see below), whose sum is σ = 15759657384. Its totient is φ = 10504684800.

The previous prime is 13131951901. The next prime is 13131951947. The reversal of 13131951905 is 50915913131.

It can be written as a sum of positive squares in 4 ways, for example, as 2570895616 + 10561056289 = 50704^2 + 102767^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13131951905 - 2² = 13131951901 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13131951901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39626 + ... + 166835.

It is an arithmetic number, because the mean of its divisors is an integer number (1969957173).

Almost surely, 2^13131951905 is an apocalyptic number.

It is an amenable number.

13131951905 is a deficient number, since it is larger than the sum of its proper divisors (2627705479).

13131951905 is a wasteful number, since it uses less digits than its factorization.

13131951905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219187.

The product of its (nonzero) digits is 18225, while the sum is 38.

The spelling of 13131951905 in words is "thirteen billion, one hundred thirty-one million, nine hundred fifty-one thousand, nine hundred five".