2155261 has 8 divisors (see below), whose sum is σ = 2278080. Its totient is φ = 2034912.

The previous prime is 2155259. The next prime is 2155267. The reversal of 2155261 is 1625512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2155261 - 2¹ = 2155259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155267) 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, 1345 + ... + 2473.

It is an arithmetic number, because the mean of its divisors is an integer number (284760).

2^2155261 is an apocalyptic number.

It is an amenable number.

2155261 is a deficient number, since it is larger than the sum of its proper divisors (122819).

2155261 is a wasteful number, since it uses less digits than its factorization.

2155261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235.

The product of its digits is 600, while the sum is 22.

The square root of 2155261 is about 1468.0807198516. The cubic root of 2155261 is about 129.1714763847.

It can be divided in two parts, 215 and 5261, that added together give a square (5476 = 74²).

The spelling of 2155261 in words is "two million, one hundred fifty-five thousand, two hundred sixty-one".