1285282861 has 2 divisors, whose sum is σ = 1285282862. Its totient is φ = 1285282860.

The previous prime is 1285282819. The next prime is 1285282879. The reversal of 1285282861 is 1682825821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 864007236 + 421275625 = 29394^2 + 20525^2 .

It is a cyclic number.

It is not a de Polignac number, because 1285282861 - 2²³ = 1276894253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1285285861) 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, 642641430 + 642641431.

It is an arithmetic number, because the mean of its divisors is an integer number (642641431).

Almost surely, 2^1285282861 is an apocalyptic number.

It is an amenable number.

1285282861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285282861 is an equidigital number, since it uses as much as digits as its factorization.

1285282861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122880, while the sum is 43.

The square root of 1285282861 is about 35850.8418450669. The cubic root of 1285282861 is about 1087.2587349756.

The spelling of 1285282861 in words is "one billion, two hundred eighty-five million, two hundred eighty-two thousand, eight hundred sixty-one".