11315215129 has 3 divisors (see below), whose sum is σ = 11315321503. Its totient is φ = 11315108756.

The previous prime is 11315215123. The next prime is 11315215139. The reversal of 11315215129 is 92151251311.

The square root of 11315215129 is 106373.

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 can be written as a sum of positive squares in only one way, i.e., 47817225 + 11267397904 = 6915^2 + 106148^2 .

It is not a de Polignac number, because 11315215129 - 2¹⁷ = 11315084057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11315215129.

It is not an unprimeable number, because it can be changed into a prime (11315215123) 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, 53187 + ... + 159559.

Almost surely, 2^11315215129 is an apocalyptic number.

11315215129 is the 106373-rd square number.

11315215129 is the 53187-th centered octagonal number.

It is an amenable number.

11315215129 is a deficient number, since it is larger than the sum of its proper divisors (106374).

11315215129 is an frugal number, since it uses more digits than its factorization.

11315215129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212746 (or 106373 counting only the distinct ones).

The product of its digits is 2700, while the sum is 31.

The spelling of 11315215129 in words is "eleven billion, three hundred fifteen million, two hundred fifteen thousand, one hundred twenty-nine".