16009631 has 24 divisors (see below), whose sum is σ = 19171152. Its totient is φ = 13305600.

The previous prime is 16009613. The next prime is 16009649. The reversal of 16009631 is 13690061.

It is an interprime number because it is at equal distance from previous prime (16009613) and next prime (16009649).

It is a de Polignac number, because none of the positive numbers 2^k-16009631 is a prime.

It is a super-2 number, since 2×16009631² = 512616569512322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16009631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16009681) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88361 + ... + 88541.

It is an arithmetic number, because the mean of its divisors is an integer number (798798).

Almost surely, 2^16009631 is an apocalyptic number.

16009631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16009631 is a deficient number, since it is larger than the sum of its proper divisors (3161521).

16009631 is a wasteful number, since it uses less digits than its factorization.

16009631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263 (or 252 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 16009631 is about 4001.2036938901. The cubic root of 16009631 is about 252.0347594196.

Adding to 16009631 its reverse (13690061), we get a palindrome (29699692).

The spelling of 16009631 in words is "sixteen million, nine thousand, six hundred thirty-one".