16731601 has 6 divisors (see below), whose sum is σ = 17131650. Its totient is φ = 16340688.

The previous prime is 16731593. The next prime is 16731619. The reversal of 16731601 is 10613761.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15992001 + 739600 = 3999^2 + 860^2 .

It is not a de Polignac number, because 16731601 - 2³ = 16731593 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16731641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2676 + ... + 6373.

It is an arithmetic number, because the mean of its divisors is an integer number (2855275).

Almost surely, 2^16731601 is an apocalyptic number.

It is an amenable number.

16731601 is a deficient number, since it is larger than the sum of its proper divisors (400049).

16731601 is an frugal number, since it uses more digits than its factorization.

16731601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9135 (or 9092 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 16731601 is about 4090.4279727187. The cubic root of 16731601 is about 255.7677795262.

The spelling of 16731601 in words is "sixteen million, seven hundred thirty-one thousand, six hundred one".