16001331631 has 8 divisors (see below), whose sum is σ = 16847686400. Its totient is φ = 15155394840.

The previous prime is 16001331629. The next prime is 16001331641. The reversal of 16001331631 is 13613310061.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16001331631 - 2¹ = 16001331629 is a prime.

It is a super-3 number, since 3×16001331631³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16001331596 and 16001331605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16001331641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24321 + ... + 180538.

It is an arithmetic number, because the mean of its divisors is an integer number (2105960800).

Almost surely, 2^16001331631 is an apocalyptic number.

16001331631 is a deficient number, since it is larger than the sum of its proper divisors (846354769).

16001331631 is a wasteful number, since it uses less digits than its factorization.

16001331631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208989.

The product of its (nonzero) digits is 972, while the sum is 25.

Adding to 16001331631 its reverse (13613310061), we get a palindrome (29614641692).

The spelling of 16001331631 in words is "sixteen billion, one million, three hundred thirty-one thousand, six hundred thirty-one".