16442731 has 2 divisors, whose sum is σ = 16442732. Its totient is φ = 16442730.

The previous prime is 16442729. The next prime is 16442737. The reversal of 16442731 is 13724461.

It is a weak prime.

It is an emirp because it is prime and its reverse (13724461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16442731 - 2¹ = 16442729 is a prime.

It is a super-3 number, since 3×16442731³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 16442729, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 16442731.

It is not a weakly prime, because it can be changed into another prime (16442737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8221365 + 8221366.

It is an arithmetic number, because the mean of its divisors is an integer number (8221366).

Almost surely, 2^16442731 is an apocalyptic number.

16442731 is a deficient number, since it is larger than the sum of its proper divisors (1).

16442731 is an equidigital number, since it uses as much as digits as its factorization.

16442731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 28.

The square root of 16442731 is about 4054.9637482966. The cubic root of 16442731 is about 254.2872883467.

The spelling of 16442731 in words is "sixteen million, four hundred forty-two thousand, seven hundred thirty-one".