8977138561 has 2 divisors, whose sum is σ = 8977138562. Its totient is φ = 8977138560.

The previous prime is 8977138543. The next prime is 8977138589. The reversal of 8977138561 is 1658317798.

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., 7196298561 + 1780840000 = 84831^2 + 42200^2 .

It is a cyclic number.

It is not a de Polignac number, because 8977138561 - 2¹⁷ = 8977007489 is a prime.

It is not a weakly prime, because it can be changed into another prime (8977138501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4488569280 + 4488569281.

It is an arithmetic number, because the mean of its divisors is an integer number (4488569281).

Almost surely, 2^8977138561 is an apocalyptic number.

It is an amenable number.

8977138561 is a deficient number, since it is larger than the sum of its proper divisors (1).

8977138561 is an equidigital number, since it uses as much as digits as its factorization.

8977138561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 55.

The square root of 8977138561 is about 94747.7628284700. The cubic root of 8977138561 is about 2078.3210811620.

The spelling of 8977138561 in words is "eight billion, nine hundred seventy-seven million, one hundred thirty-eight thousand, five hundred sixty-one".