16061781 has 4 divisors (see below), whose sum is σ = 21415712. Its totient is φ = 10707852.

The previous prime is 16061777. The next prime is 16061789. The reversal of 16061781 is 18716061.

It is a happy number.

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.

It is not a de Polignac number, because 16061781 - 2² = 16061777 is a prime.

It is a super-2 number, since 2×16061781² = 515961617783922, 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 (16061789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2676961 + ... + 2676966.

It is an arithmetic number, because the mean of its divisors is an integer number (5353928).

Almost surely, 2^16061781 is an apocalyptic number.

It is an amenable number.

16061781 is a deficient number, since it is larger than the sum of its proper divisors (5353931).

16061781 is an equidigital number, since it uses as much as digits as its factorization.

16061781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5353930.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 16061781 is about 4007.7151844910. The cubic root of 16061781 is about 252.3081233524.

The spelling of 16061781 in words is "sixteen million, sixty-one thousand, seven hundred eighty-one".