16172513 has 4 divisors (see below), whose sum is σ = 18482880. Its totient is φ = 13862148.

The previous prime is 16172509. The next prime is 16172521. The reversal of 16172513 is 31527161.

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: 31527161 = 2137 ⋅14753.

It is a cyclic number.

It is not a de Polignac number, because 16172513 - 2² = 16172509 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16171513) 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, 1155173 + ... + 1155186.

It is an arithmetic number, because the mean of its divisors is an integer number (4620720).

Almost surely, 2^16172513 is an apocalyptic number.

It is an amenable number.

16172513 is a deficient number, since it is larger than the sum of its proper divisors (2310367).

16172513 is an equidigital number, since it uses as much as digits as its factorization.

16172513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2310366.

The product of its digits is 1260, while the sum is 26.

The square root of 16172513 is about 4021.5063098297. The cubic root of 16172513 is about 252.8866109606.

Adding to 16172513 its reverse (31527161), we get a palindrome (47699674).

The spelling of 16172513 in words is "sixteen million, one hundred seventy-two thousand, five hundred thirteen".