2155061 has 4 divisors (see below), whose sum is σ = 2167692. Its totient is φ = 2142432.

The previous prime is 2155057. The next prime is 2155067. The reversal of 2155061 is 1605512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1874161 + 280900 = 1369^2 + 530^2 .

It is not a de Polignac number, because 2155061 - 2² = 2155057 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 (2155067) 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, 6056 + ... + 6401.

It is an arithmetic number, because the mean of its divisors is an integer number (541923).

2^2155061 is an apocalyptic number.

It is an amenable number.

2155061 is a deficient number, since it is larger than the sum of its proper divisors (12631).

2155061 is a wasteful number, since it uses less digits than its factorization.

2155061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12630.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 2155061 is about 1468.0126021257. The cubic root of 2155061 is about 129.1674807210.

The spelling of 2155061 in words is "two million, one hundred fifty-five thousand, sixty-one".