2877661 has 2 divisors, whose sum is σ = 2877662. Its totient is φ = 2877660.

The previous prime is 2877659. The next prime is 2877673. The reversal of 2877661 is 1667782.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1452025 + 1425636 = 1205^2 + 1194^2 .

It is a cyclic number.

It is not a de Polignac number, because 2877661 - 2¹ = 2877659 is a prime.

Together with 2877659, it forms a pair of twin primes.

2877661 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2877661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2877631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1438830 + 1438831.

It is an arithmetic number, because the mean of its divisors is an integer number (1438831).

2^2877661 is an apocalyptic number.

It is an amenable number.

2877661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2877661 is an equidigital number, since it uses as much as digits as its factorization.

2877661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 37.

The square root of 2877661 is about 1696.3670003864. The cubic root of 2877661 is about 142.2372052041.

The spelling of 2877661 in words is "two million, eight hundred seventy-seven thousand, six hundred sixty-one".