16610861 has 4 divisors (see below), whose sum is σ = 16619424. Its totient is φ = 16602300.

The previous prime is 16610827. The next prime is 16610903. The reversal of 16610861 is 16801661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16610861 is a prime.

It is a super-2 number, since 2×16610861² = 551841406322642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16670861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176 + ... + 5766.

It is an arithmetic number, because the mean of its divisors is an integer number (4154856).

Almost surely, 2^16610861 is an apocalyptic number.

It is an amenable number.

16610861 is a deficient number, since it is larger than the sum of its proper divisors (8563).

16610861 is an equidigital number, since it uses as much as digits as its factorization.

16610861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8562.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 16610861 is about 4075.6424033519. The cubic root of 16610861 is about 255.1510626135.

It can be divided in two parts, 16610 and 861, that added together give a palindrome (17471).

The spelling of 16610861 in words is "sixteen million, six hundred ten thousand, eight hundred sixty-one".