232779281561 has 2 divisors, whose sum is σ = 232779281562. Its totient is φ = 232779281560.

The previous prime is 232779281519. The next prime is 232779281563. The reversal of 232779281561 is 165182977232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 220186177600 + 12593103961 = 469240^2 + 112219^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-232779281561 is a prime.

Together with 232779281563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (232779281563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 116389640780 + 116389640781.

It is an arithmetic number, because the mean of its divisors is an integer number (116389640781).

Almost surely, 2^232779281561 is an apocalyptic number.

It is an amenable number.

232779281561 is a deficient number, since it is larger than the sum of its proper divisors (1).

232779281561 is an equidigital number, since it uses as much as digits as its factorization.

232779281561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2540160, while the sum is 53.

The spelling of 232779281561 in words is "two hundred thirty-two billion, seven hundred seventy-nine million, two hundred eighty-one thousand, five hundred sixty-one".