16619961 has 8 divisors (see below), whose sum is σ = 23123520. Its totient is φ = 10598192.

The previous prime is 16619959. The next prime is 16620001. The reversal of 16619961 is 16991661.

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

It is a cyclic number.

It is not a de Polignac number, because 16619961 - 2¹ = 16619959 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16619261) 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, 120366 + ... + 120503.

It is an arithmetic number, because the mean of its divisors is an integer number (2890440).

Almost surely, 2^16619961 is an apocalyptic number.

It is an amenable number.

16619961 is a deficient number, since it is larger than the sum of its proper divisors (6503559).

16619961 is a wasteful number, since it uses less digits than its factorization.

16619961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240895.

The product of its digits is 17496, while the sum is 39.

The square root of 16619961 is about 4076.7586389189. The cubic root of 16619961 is about 255.1976476118.

The spelling of 16619961 in words is "sixteen million, six hundred nineteen thousand, nine hundred sixty-one".