16172213 has 4 divisors (see below), whose sum is σ = 16265868. Its totient is φ = 16078560.

The previous prime is 16172207. The next prime is 16172231. The reversal of 16172213 is 31227161.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14303524 + 1868689 = 3782^2 + 1367^2 .

It is a cyclic number.

It is not a de Polignac number, because 16172213 - 2⁸ = 16171957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16172203) 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, 46568 + ... + 46913.

It is an arithmetic number, because the mean of its divisors is an integer number (4066467).

Almost surely, 2^16172213 is an apocalyptic number.

It is an amenable number.

16172213 is a deficient number, since it is larger than the sum of its proper divisors (93655).

16172213 is an equidigital number, since it uses as much as digits as its factorization.

16172213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93654.

The product of its digits is 504, while the sum is 23.

The square root of 16172213 is about 4021.4690102001. The cubic root of 16172213 is about 252.8850472694.

Adding to 16172213 its reverse (31227161), we get a palindrome (47399374).

The spelling of 16172213 in words is "sixteen million, one hundred seventy-two thousand, two hundred thirteen".