16781051 has 16 divisors (see below), whose sum is σ = 19793664. Its totient is φ = 13928544.

The previous prime is 16781033. The next prime is 16781059. The reversal of 16781051 is 15018761.

It is not a de Polignac number, because 16781051 - 2⁶ = 16780987 is a prime.

It is a Duffinian number.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59156 + ... + 59438.

It is an arithmetic number, because the mean of its divisors is an integer number (1237104).

Almost surely, 2^16781051 is an apocalyptic number.

16781051 is a deficient number, since it is larger than the sum of its proper divisors (3012613).

16781051 is a wasteful number, since it uses less digits than its factorization.

16781051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530.

The product of its (nonzero) digits is 1680, while the sum is 29.

The square root of 16781051 is about 4096.4681128992. The cubic root of 16781051 is about 256.0195043326.

It can be divided in two parts, 167 and 81051, that added together give a palindrome (81218).

The spelling of 16781051 in words is "sixteen million, seven hundred eighty-one thousand, fifty-one".