83960561 has 2 divisors, whose sum is σ = 83960562. Its totient is φ = 83960560.

The previous prime is 83960537. The next prime is 83960567. The reversal of 83960561 is 16506938.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44823025 + 39137536 = 6695^2 + 6256^2 .

It is a cyclic number.

It is not a de Polignac number, because 83960561 - 2²² = 79766257 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (83960567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41980280 + 41980281.

It is an arithmetic number, because the mean of its divisors is an integer number (41980281).

Almost surely, 2^83960561 is an apocalyptic number.

It is an amenable number.

83960561 is a deficient number, since it is larger than the sum of its proper divisors (1).

83960561 is an equidigital number, since it uses as much as digits as its factorization.

83960561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 83960561 is about 9162.9995634617. Note that the first 3 decimals coincide. The cubic root of 83960561 is about 437.8833620466.

The spelling of 83960561 in words is "eighty-three million, nine hundred sixty thousand, five hundred sixty-one".