16061561 has 4 divisors (see below), whose sum is σ = 16091472. Its totient is φ = 16031652.

The previous prime is 16061557. The next prime is 16061599. The reversal of 16061561 is 16516061.

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 a cyclic number.

It is not a de Polignac number, because 16061561 - 2² = 16061557 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16061561.

It is not an unprimeable number, because it can be changed into a prime (16061501) 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, 14135 + ... + 15228.

It is an arithmetic number, because the mean of its divisors is an integer number (4022868).

Almost surely, 2^16061561 is an apocalyptic number.

It is an amenable number.

16061561 is a deficient number, since it is larger than the sum of its proper divisors (29911).

16061561 is an equidigital number, since it uses as much as digits as its factorization.

16061561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29910.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 16061561 is about 4007.6877373368. The cubic root of 16061561 is about 252.3069713830.

The spelling of 16061561 in words is "sixteen million, sixty-one thousand, five hundred sixty-one".