2877561 has 6 divisors (see below), whose sum is σ = 4156490. Its totient is φ = 1918368.

The previous prime is 2877557. The next prime is 2877571. The reversal of 2877561 is 1657782.

2877561 is a `hidden beast` number, since 28 + 77 + 561 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1806336 + 1071225 = 1344^2 + 1035^2 .

It is not a de Polignac number, because 2877561 - 2² = 2877557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2877571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 159856 + ... + 159873.

2^2877561 is an apocalyptic number.

It is an amenable number.

2877561 is a deficient number, since it is larger than the sum of its proper divisors (1278929).

2877561 is a wasteful number, since it uses less digits than its factorization.

2877561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319735 (or 319732 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 2877561 is about 1696.3375253764. The cubic root of 2877561 is about 142.2355575830.

The spelling of 2877561 in words is "two million, eight hundred seventy-seven thousand, five hundred sixty-one".