283661561 has 2 divisors, whose sum is σ = 283661562. Its totient is φ = 283661560.

The previous prime is 283661551. The next prime is 283661569. The reversal of 283661561 is 165166382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 264257536 + 19404025 = 16256^2 + 4405^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-283661561 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (283661569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 141830780 + 141830781.

It is an arithmetic number, because the mean of its divisors is an integer number (141830781).

Almost surely, 2^283661561 is an apocalyptic number.

It is an amenable number.

283661561 is a deficient number, since it is larger than the sum of its proper divisors (1).

283661561 is an equidigital number, since it uses as much as digits as its factorization.

283661561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 38.

The square root of 283661561 is about 16842.2552230988. The cubic root of 283661561 is about 657.0526373194.

The spelling of 283661561 in words is "two hundred eighty-three million, six hundred sixty-one thousand, five hundred sixty-one".