16561912 has 8 divisors (see below), whose sum is σ = 31053600. Its totient is φ = 8280952.

The previous prime is 16561889. The next prime is 16561913. The reversal of 16561912 is 21916561.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16561913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1035112 + ... + 1035127.

It is an arithmetic number, because the mean of its divisors is an integer number (3881700).

Almost surely, 2^16561912 is an apocalyptic number.

It is an amenable number.

16561912 is a deficient number, since it is larger than the sum of its proper divisors (14491688).

16561912 is a wasteful number, since it uses less digits than its factorization.

16561912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2070245 (or 2070241 counting only the distinct ones).

The product of its digits is 3240, while the sum is 31.

The square root of 16561912 is about 4069.6329072780. The cubic root of 16561912 is about 254.9001890549.

The spelling of 16561912 in words is "sixteen million, five hundred sixty-one thousand, nine hundred twelve".