2072661 has 4 divisors (see below), whose sum is σ = 2763552. Its totient is φ = 1381772.

The previous prime is 2072647. The next prime is 2072663. The reversal of 2072661 is 1662702.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 2072661 - 2¹¹ = 2070613 is a prime.

It is a D-number.

2072661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2072663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345441 + ... + 345446.

It is an arithmetic number, because the mean of its divisors is an integer number (690888).

2^2072661 is an apocalyptic number.

It is an amenable number.

2072661 is a deficient number, since it is larger than the sum of its proper divisors (690891).

2072661 is an equidigital number, since it uses as much as digits as its factorization.

2072661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690890.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 2072661 is about 1439.6739214142. The cubic root of 2072661 is about 127.4997770085.

The spelling of 2072661 in words is "two million, seventy-two thousand, six hundred sixty-one".