215438694113 has 4 divisors (see below), whose sum is σ = 219503575188. Its totient is φ = 211373813040.

The previous prime is 215438694109. The next prime is 215438694143. The reversal of 215438694113 is 311496834512.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 78858187489 + 136580506624 = 280817^2 + 369568^2 .

It is a cyclic number.

It is not a de Polignac number, because 215438694113 - 2² = 215438694109 is a prime.

It is a super-2 number, since 2×215438694113² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215438694143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2032440458 + ... + 2032440563.

It is an arithmetic number, because the mean of its divisors is an integer number (54875893797).

Almost surely, 2^215438694113 is an apocalyptic number.

It is an amenable number.

215438694113 is a deficient number, since it is larger than the sum of its proper divisors (4064881075).

215438694113 is an equidigital number, since it uses as much as digits as its factorization.

215438694113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4064881074.

The product of its digits is 622080, while the sum is 47.

The spelling of 215438694113 in words is "two hundred fifteen billion, four hundred thirty-eight million, six hundred ninety-four thousand, one hundred thirteen".