16512481 has 4 divisors (see below), whose sum is σ = 16586752. Its totient is φ = 16438212.

The previous prime is 16512479. The next prime is 16512493. The reversal of 16512481 is 18421561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18421561 = 97 ⋅189913.

It is a cyclic number.

It is not a de Polignac number, because 16512481 - 2¹ = 16512479 is a prime.

It is a super-2 number, since 2×16512481² = 545324057550722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16512401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36801 + ... + 37246.

It is an arithmetic number, because the mean of its divisors is an integer number (4146688).

Almost surely, 2^16512481 is an apocalyptic number.

It is an amenable number.

16512481 is a deficient number, since it is larger than the sum of its proper divisors (74271).

16512481 is an equidigital number, since it uses as much as digits as its factorization.

16512481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74270.

The product of its digits is 1920, while the sum is 28.

The square root of 16512481 is about 4063.5552168022. Note that the first 3 decimals coincide. The cubic root of 16512481 is about 254.6463430126.

The spelling of 16512481 in words is "sixteen million, five hundred twelve thousand, four hundred eighty-one".