16530551 has 12 divisors (see below), whose sum is σ = 18059400. Its totient is φ = 15110928.

The previous prime is 16530539. The next prime is 16530571. The reversal of 16530551 is 15503561.

It is not a de Polignac number, because 16530551 - 2⁶ = 16530487 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 16530551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16530571) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9680 + ... + 11258.

It is an arithmetic number, because the mean of its divisors is an integer number (1504950).

Almost surely, 2^16530551 is an apocalyptic number.

16530551 is a deficient number, since it is larger than the sum of its proper divisors (1528849).

16530551 is a wasteful number, since it uses less digits than its factorization.

16530551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1646 (or 1627 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 26.

The square root of 16530551 is about 4065.7780313244. The cubic root of 16530551 is about 254.7391976628.

The spelling of 16530551 in words is "sixteen million, five hundred thirty thousand, five hundred fifty-one".