16540009231 has 2 divisors, whose sum is σ = 16540009232. Its totient is φ = 16540009230.

The previous prime is 16540009229. The next prime is 16540009243. The reversal of 16540009231 is 13290004561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16540009231 - 2¹ = 16540009229 is a prime.

It is a super-2 number, since 2×16540009231² (a number of 21 digits) contains 22 as substring.

Together with 16540009229, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 16540009193 and 16540009202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16540009261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8270004615 + 8270004616.

It is an arithmetic number, because the mean of its divisors is an integer number (8270004616).

Almost surely, 2^16540009231 is an apocalyptic number.

16540009231 is a deficient number, since it is larger than the sum of its proper divisors (1).

16540009231 is an equidigital number, since it uses as much as digits as its factorization.

16540009231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 31.

The spelling of 16540009231 in words is "sixteen billion, five hundred forty million, nine thousand, two hundred thirty-one".