2787161 has 8 divisors (see below), whose sum is σ = 3105480. Its totient is φ = 2483712.

The previous prime is 2787157. The next prime is 2787181. The reversal of 2787161 is 1617872.

2787161 = 1180² + 1181².

2787161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1600 + 2785561 = 40^2 + 1669^2 .

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 2787161 - 2² = 2787157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2787121) 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 7 ways as a sum of consecutive naturals, for example, 3320 + ... + 4073.

It is an arithmetic number, because the mean of its divisors is an integer number (388185).

2^2787161 is an apocalyptic number.

2787161 is the 1181-st centered square number.

It is an amenable number.

2787161 is a deficient number, since it is larger than the sum of its proper divisors (318319).

2787161 is a wasteful number, since it uses less digits than its factorization.

2787161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7435.

The product of its digits is 4704, while the sum is 32.

The square root of 2787161 is about 1669.4792601287. The cubic root of 2787161 is about 140.7302153161.

The spelling of 2787161 in words is "two million, seven hundred eighty-seven thousand, one hundred sixty-one".