2159651 has 8 divisors (see below), whose sum is σ = 2341920. Its totient is φ = 1991496.

The previous prime is 2159639. The next prime is 2159669. The reversal of 2159651 is 1569512.

It is not a de Polignac number, because 2159651 - 2¹⁰ = 2158627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2159621) 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, 1706 + ... + 2688.

It is an arithmetic number, because the mean of its divisors is an integer number (292740).

2^2159651 is an apocalyptic number.

2159651 is a deficient number, since it is larger than the sum of its proper divisors (182269).

2159651 is an frugal number, since it uses more digits than its factorization.

2159651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1022 (or 996 counting only the distinct ones).

The product of its digits is 2700, while the sum is 29.

The square root of 2159651 is about 1469.5751086624. The cubic root of 2159651 is about 129.2591190111.

The spelling of 2159651 in words is "two million, one hundred fifty-nine thousand, six hundred fifty-one".