2159761 has 4 divisors (see below), whose sum is σ = 2210032. Its totient is φ = 2109492.

The previous prime is 2159719. The next prime is 2159767. The reversal of 2159761 is 1679512.

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 2159761 - 2⁹ = 2159249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2159767) 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, 25071 + ... + 25156.

It is an arithmetic number, because the mean of its divisors is an integer number (552508).

2^2159761 is an apocalyptic number.

It is an amenable number.

2159761 is a deficient number, since it is larger than the sum of its proper divisors (50271).

2159761 is an equidigital number, since it uses as much as digits as its factorization.

2159761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50270.

The product of its digits is 3780, while the sum is 31.

The square root of 2159761 is about 1469.6125339694. The cubic root of 2159761 is about 129.2613135419.

Subtracting from 2159761 its reverse (1679512), we obtain a square (480249 = 693²).

The spelling of 2159761 in words is "two million, one hundred fifty-nine thousand, seven hundred sixty-one".