16513491 has 4 divisors (see below), whose sum is σ = 22017992. Its totient is φ = 11008992.

The previous prime is 16513463. The next prime is 16513501. The reversal of 16513491 is 19431561.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 16513491 - 2⁷ = 16513363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16513411) 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, 2752246 + ... + 2752251.

It is an arithmetic number, because the mean of its divisors is an integer number (5504498).

Almost surely, 2^16513491 is an apocalyptic number.

16513491 is a deficient number, since it is larger than the sum of its proper divisors (5504501).

16513491 is an equidigital number, since it uses as much as digits as its factorization.

16513491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5504500.

The product of its digits is 3240, while the sum is 30.

The square root of 16513491 is about 4063.6794903142. The cubic root of 16513491 is about 254.6515347938.

The spelling of 16513491 in words is "sixteen million, five hundred thirteen thousand, four hundred ninety-one".