16243381331 has 4 divisors (see below), whose sum is σ = 16295277432. Its totient is φ = 16191485232.

The previous prime is 16243381321. The next prime is 16243381337. The reversal of 16243381331 is 13318334261.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16243381331 is a prime.

It is a super-2 number, since 2×16243381331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16243381291 and 16243381300.

It is not an unprimeable number, because it can be changed into a prime (16243381337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25947581 + ... + 25948206.

It is an arithmetic number, because the mean of its divisors is an integer number (4073819358).

Almost surely, 2^16243381331 is an apocalyptic number.

16243381331 is a deficient number, since it is larger than the sum of its proper divisors (51896101).

16243381331 is an equidigital number, since it uses as much as digits as its factorization.

16243381331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51896100.

The product of its digits is 31104, while the sum is 35.

The spelling of 16243381331 in words is "sixteen billion, two hundred forty-three million, three hundred eighty-one thousand, three hundred thirty-one".