2817661 has 32 divisors (see below), whose sum is σ = 3852288. Its totient is φ = 1995840.

The previous prime is 2817649. The next prime is 2817667. The reversal of 2817661 is 1667182.

It is not a de Polignac number, because 2817661 - 2⁵ = 2817629 is a prime.

It is a super-4 number, since 4×2817661⁴ (a number of 27 digits) contains 4444 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2817667) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65506 + ... + 65548.

It is an arithmetic number, because the mean of its divisors is an integer number (120384).

2^2817661 is an apocalyptic number.

It is an amenable number.

2817661 is a deficient number, since it is larger than the sum of its proper divisors (1034627).

2817661 is a wasteful number, since it uses less digits than its factorization.

2817661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121.

The product of its digits is 4032, while the sum is 31.

The square root of 2817661 is about 1678.5889907896. The cubic root of 2817661 is about 141.2416926746.

It can be divided in two parts, 28 and 17661, that added together give a square (17689 = 133²).

The spelling of 2817661 in words is "two million, eight hundred seventeen thousand, six hundred sixty-one".