83291561 has 2 divisors, whose sum is σ = 83291562. Its totient is φ = 83291560.

The previous prime is 83291557. The next prime is 83291581. The reversal of 83291561 is 16519238.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77440000 + 5851561 = 8800^2 + 2419^2 .

It is a cyclic number.

It is not a de Polignac number, because 83291561 - 2² = 83291557 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (83291581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41645780 + 41645781.

It is an arithmetic number, because the mean of its divisors is an integer number (41645781).

Almost surely, 2^83291561 is an apocalyptic number.

It is an amenable number.

83291561 is a deficient number, since it is larger than the sum of its proper divisors (1).

83291561 is an equidigital number, since it uses as much as digits as its factorization.

83291561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 35.

The square root of 83291561 is about 9126.4210400354. The cubic root of 83291561 is about 436.7172371813.

The spelling of 83291561 in words is "eighty-three million, two hundred ninety-one thousand, five hundred sixty-one".