16561498 has 4 divisors (see below), whose sum is σ = 24842250. Its totient is φ = 8280748.

The previous prime is 16561469. The next prime is 16561507. The reversal of 16561498 is 89416561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16426809 + 134689 = 4053^2 + 367^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 16561498.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4140373 + ... + 4140376.

Almost surely, 2^16561498 is an apocalyptic number.

16561498 is a deficient number, since it is larger than the sum of its proper divisors (8280752).

16561498 is an equidigital number, since it uses as much as digits as its factorization.

16561498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8280751.

The product of its digits is 51840, while the sum is 40.

The square root of 16561498 is about 4069.5820424216. The cubic root of 16561498 is about 254.8980651142.

The spelling of 16561498 in words is "sixteen million, five hundred sixty-one thousand, four hundred ninety-eight".