16116781 has 4 divisors (see below), whose sum is σ = 16125472. Its totient is φ = 16108092.

The previous prime is 16116761. The next prime is 16116797. The reversal of 16116781 is 18761161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 16116781 - 2¹⁷ = 15985709 is a prime.

It is a super-2 number, since 2×16116781² = 519501259603922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16116761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 321 + ... + 5686.

It is an arithmetic number, because the mean of its divisors is an integer number (4031368).

Almost surely, 2^16116781 is an apocalyptic number.

It is an amenable number.

16116781 is a deficient number, since it is larger than the sum of its proper divisors (8691).

16116781 is an equidigital number, since it uses as much as digits as its factorization.

16116781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8690.

The product of its digits is 2016, while the sum is 31.

The square root of 16116781 is about 4014.5710854337. The cubic root of 16116781 is about 252.5957862905.

The spelling of 16116781 in words is "sixteen million, one hundred sixteen thousand, seven hundred eighty-one".