16309231538491 has 8 divisors (see below), whose sum is σ = 17187644382480. Its totient is φ = 15432821918208.

The previous prime is 16309231538477. The next prime is 16309231538503. The reversal of 16309231538491 is 19483513290361.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16309231538491 is a prime.

It is a super-2 number, since 2×16309231538491² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16309231535491) 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, 500789206 + ... + 500821771.

It is an arithmetic number, because the mean of its divisors is an integer number (2148455547810).

Almost surely, 2^{16309231538491} is an apocalyptic number.

16309231538491 is a deficient number, since it is larger than the sum of its proper divisors (878412843989).

16309231538491 is a wasteful number, since it uses less digits than its factorization.

16309231538491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001611853.

The product of its (nonzero) digits is 4199040, while the sum is 55.

The spelling of 16309231538491 in words is "sixteen trillion, three hundred nine billion, two hundred thirty-one million, five hundred thirty-eight thousand, four hundred ninety-one".