16561154 has 4 divisors (see below), whose sum is σ = 24841734. Its totient is φ = 8280576.

The previous prime is 16561147. The next prime is 16561157. The reversal of 16561154 is 45116561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45116561 = 7 ⋅6445223.

It can be written as a sum of positive squares in only one way, i.e., 14235529 + 2325625 = 3773^2 + 1525^2 .

It is not an unprimeable number, because it can be changed into a prime (16561157) 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 as a sum of consecutive naturals, namely, 4140287 + ... + 4140290.

Almost surely, 2^16561154 is an apocalyptic number.

16561154 is a deficient number, since it is larger than the sum of its proper divisors (8280580).

16561154 is an equidigital number, since it uses as much as digits as its factorization.

16561154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8280579.

The product of its digits is 3600, while the sum is 29.

The square root of 16561154 is about 4069.5397774196. The cubic root of 16561154 is about 254.8963002670.

The spelling of 16561154 in words is "sixteen million, five hundred sixty-one thousand, one hundred fifty-four".