16201631 has 4 divisors (see below), whose sum is σ = 16236792. Its totient is φ = 16166472.

The previous prime is 16201621. The next prime is 16201657. The reversal of 16201631 is 13610261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13610261 = 7 ⋅1944323.

It is a cyclic number.

It is not a de Polignac number, because 16201631 - 2⁶ = 16201567 is a prime.

It is a super-2 number, since 2×16201631² = 524985694120322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16201621) 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, 16880 + ... + 17813.

It is an arithmetic number, because the mean of its divisors is an integer number (4059198).

Almost surely, 2^16201631 is an apocalyptic number.

16201631 is a deficient number, since it is larger than the sum of its proper divisors (35161).

16201631 is an equidigital number, since it uses as much as digits as its factorization.

16201631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35160.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 16201631 is about 4025.1249670041. The cubic root of 16201631 is about 253.0382909023.

Adding to 16201631 its reverse (13610261), we get a palindrome (29811892).

The spelling of 16201631 in words is "sixteen million, two hundred one thousand, six hundred thirty-one".