16478881 has 2 divisors, whose sum is σ = 16478882. Its totient is φ = 16478880.

The previous prime is 16478863. The next prime is 16478897. The reversal of 16478881 is 18887461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13571856 + 2907025 = 3684^2 + 1705^2 .

It is an emirp because it is prime and its reverse (18887461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16478881 - 2⁵ = 16478849 is a prime.

It is a super-2 number, since 2×16478881² = 543107038024322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16478381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8239440 + 8239441.

It is an arithmetic number, because the mean of its divisors is an integer number (8239441).

Almost surely, 2^16478881 is an apocalyptic number.

It is an amenable number.

16478881 is a deficient number, since it is larger than the sum of its proper divisors (1).

16478881 is an equidigital number, since it uses as much as digits as its factorization.

16478881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86016, while the sum is 43.

The square root of 16478881 is about 4059.4188007645. The cubic root of 16478881 is about 254.4735055270.

The spelling of 16478881 in words is "sixteen million, four hundred seventy-eight thousand, eight hundred eighty-one".