16503641 has 24 divisors (see below), whose sum is σ = 21302496. Its totient is φ = 12640320.

The previous prime is 16503631. The next prime is 16503649. The reversal of 16503641 is 14630561.

It is not a de Polignac number, because 16503641 - 2⁶ = 16503577 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16503641.

It is not an unprimeable number, because it can be changed into a prime (16503649) 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, 35885 + ... + 36341.

It is an arithmetic number, because the mean of its divisors is an integer number (887604).

Almost surely, 2^16503641 is an apocalyptic number.

16503641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16503641 is a deficient number, since it is larger than the sum of its proper divisors (4798855).

16503641 is a wasteful number, since it uses less digits than its factorization.

16503641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549 (or 542 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 16503641 is about 4062.4673537150. The cubic root of 16503641 is about 254.6008930386.

Subtracting from 16503641 its reverse (14630561), we obtain a triangular number (1873080 = T₁₉₃₅).

The spelling of 16503641 in words is "sixteen million, five hundred three thousand, six hundred forty-one".