16781049 has 12 divisors (see below), whose sum is σ = 24480612. Its totient is φ = 11076000.

The previous prime is 16781033. The next prime is 16781059. The reversal of 16781049 is 94018761.

It can be written as a sum of positive squares in 2 ways, for example, as 8555625 + 8225424 = 2925^2 + 2868^2 .

It is not a de Polignac number, because 16781049 - 2⁴ = 16781033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16781059) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8322 + ... + 10139.

It is an arithmetic number, because the mean of its divisors is an integer number (2040051).

Almost surely, 2^16781049 is an apocalyptic number.

It is an amenable number.

16781049 is a deficient number, since it is larger than the sum of its proper divisors (7699563).

16781049 is a wasteful number, since it uses less digits than its factorization.

16781049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18568 (or 18565 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 16781049 is about 4096.4678687865. The cubic root of 16781049 is about 256.0194941617.

The spelling of 16781049 in words is "sixteen million, seven hundred eighty-one thousand, forty-nine".