16491554 has 4 divisors (see below), whose sum is σ = 24737334. Its totient is φ = 8245776.

The previous prime is 16491551. The next prime is 16491569. The reversal of 16491554 is 45519461.

16491554 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 8567329 + 7924225 = 2927^2 + 2815^2 .

It is a Curzon number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (16491551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4122887 + ... + 4122890.

Almost surely, 2^16491554 is an apocalyptic number.

16491554 is a deficient number, since it is larger than the sum of its proper divisors (8245780).

16491554 is an equidigital number, since it uses as much as digits as its factorization.

16491554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8245779.

The product of its digits is 21600, while the sum is 35.

The square root of 16491554 is about 4060.9794385099. The cubic root of 16491554 is about 254.5387226652.

The spelling of 16491554 in words is "sixteen million, four hundred ninety-one thousand, five hundred fifty-four".