16521145 has 8 divisors (see below), whose sum is σ = 19859904. Its totient is φ = 13193904.

The previous prime is 16521133. The next prime is 16521149. The reversal of 16521145 is 54112561.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 16521145 - 2¹³ = 16512953 is a prime.

It is a super-2 number, since 2×16521145² = 545896464222050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16521149) 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, 682 + ... + 5788.

It is an arithmetic number, because the mean of its divisors is an integer number (2482488).

Almost surely, 2^16521145 is an apocalyptic number.

It is an amenable number.

16521145 is a deficient number, since it is larger than the sum of its proper divisors (3338759).

16521145 is an equidigital number, since it uses as much as digits as its factorization.

16521145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5759.

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

The square root of 16521145 is about 4064.6211385565. The cubic root of 16521145 is about 254.6908723630.

The spelling of 16521145 in words is "sixteen million, five hundred twenty-one thousand, one hundred forty-five".