16391512243 has 4 divisors (see below), whose sum is σ = 16392608568. Its totient is φ = 16390415920.

The previous prime is 16391512169. The next prime is 16391512253. The reversal of 16391512243 is 34221519361.

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

It is a cyclic number.

It is not a de Polignac number, because 16391512243 - 2²⁹ = 15854641331 is a prime.

It is a super-2 number, since 2×16391512243² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16391512253) 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, 525421 + ... + 555742.

It is an arithmetic number, because the mean of its divisors is an integer number (4098152142).

Almost surely, 2^16391512243 is an apocalyptic number.

16391512243 is a deficient number, since it is larger than the sum of its proper divisors (1096325).

16391512243 is a wasteful number, since it uses less digits than its factorization.

16391512243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1096324.

The product of its digits is 38880, while the sum is 37.

The spelling of 16391512243 in words is "sixteen billion, three hundred ninety-one million, five hundred twelve thousand, two hundred forty-three".