1285317421 has 2 divisors, whose sum is σ = 1285317422. Its totient is φ = 1285317420.

The previous prime is 1285317403. The next prime is 1285317431. The reversal of 1285317421 is 1247135821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1055340196 + 229977225 = 32486^2 + 15165^2 .

It is a cyclic number.

It is not a de Polignac number, because 1285317421 - 2⁵ = 1285317389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1285317401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642658710 + 642658711.

It is an arithmetic number, because the mean of its divisors is an integer number (642658711).

Almost surely, 2^1285317421 is an apocalyptic number.

It is an amenable number.

1285317421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285317421 is an equidigital number, since it uses as much as digits as its factorization.

1285317421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 34.

The square root of 1285317421 is about 35851.3238388766. The cubic root of 1285317421 is about 1087.2684799965.

The spelling of 1285317421 in words is "one billion, two hundred eighty-five million, three hundred seventeen thousand, four hundred twenty-one".