16145521 has 8 divisors (see below), whose sum is σ = 18480960. Its totient is φ = 13817328.

The previous prime is 16145477. The next prime is 16145531. The reversal of 16145521 is 12554161.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-16145521 is a prime.

It is a super-2 number, since 2×16145521² = 521355696722882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16145531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4395 + ... + 7183.

It is an arithmetic number, because the mean of its divisors is an integer number (2310120).

Almost surely, 2^16145521 is an apocalyptic number.

It is an amenable number.

16145521 is a deficient number, since it is larger than the sum of its proper divisors (2335439).

16145521 is an equidigital number, since it uses as much as digits as its factorization.

16145521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3623.

The product of its digits is 1200, while the sum is 25.

The square root of 16145521 is about 4018.1489519429. The cubic root of 16145521 is about 252.7458429711.

Adding to 16145521 its reverse (12554161), we get a palindrome (28699682).

The spelling of 16145521 in words is "sixteen million, one hundred forty-five thousand, five hundred twenty-one".