16551541 has 4 divisors (see below), whose sum is σ = 16703500. Its totient is φ = 16399584.

The previous prime is 16551533. The next prime is 16551583. The reversal of 16551541 is 14515561.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14515561 = 137 ⋅105953.

It can be written as a sum of positive squares in 2 ways, for example, as 5522500 + 11029041 = 2350^2 + 3321^2 .

It is a cyclic number.

It is not a de Polignac number, because 16551541 - 2³ = 16551533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16551511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75816 + ... + 76033.

It is an arithmetic number, because the mean of its divisors is an integer number (4175875).

Almost surely, 2^16551541 is an apocalyptic number.

It is an amenable number.

16551541 is a deficient number, since it is larger than the sum of its proper divisors (151959).

16551541 is a wasteful number, since it uses less digits than its factorization.

16551541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151958.

The product of its digits is 3000, while the sum is 28.

The square root of 16551541 is about 4068.3585141922. The cubic root of 16551541 is about 254.8469721347.

The spelling of 16551541 in words is "sixteen million, five hundred fifty-one thousand, five hundred forty-one".