876649561 has 2 divisors, whose sum is σ = 876649562. Its totient is φ = 876649560.

The previous prime is 876649559. The next prime is 876649603. The reversal of 876649561 is 165946678.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 466344025 + 410305536 = 21595^2 + 20256^2 .

It is a cyclic number.

It is not a de Polignac number, because 876649561 - 2¹ = 876649559 is a prime.

Together with 876649559, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 876649499 and 876649508.

It is not a weakly prime, because it can be changed into another prime (876649061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 438324780 + 438324781.

It is an arithmetic number, because the mean of its divisors is an integer number (438324781).

Almost surely, 2^876649561 is an apocalyptic number.

It is an amenable number.

876649561 is a deficient number, since it is larger than the sum of its proper divisors (1).

876649561 is an equidigital number, since it uses as much as digits as its factorization.

876649561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 52.

The square root of 876649561 is about 29608.2684566322. The cubic root of 876649561 is about 957.0662610665.

The spelling of 876649561 in words is "eight hundred seventy-six million, six hundred forty-nine thousand, five hundred sixty-one".