1285479869 has 2 divisors, whose sum is σ = 1285479870. Its totient is φ = 1285479868.

The previous prime is 1285479859. The next prime is 1285479887. The reversal of 1285479869 is 9689745821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1194048025 + 91431844 = 34555^2 + 9562^2 .

It is a cyclic number.

It is not a de Polignac number, because 1285479869 - 2²⁴ = 1268702653 is a prime.

It is a super-2 number, since 2×1285479869² = 3304916987208514322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1285479809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642739934 + 642739935.

It is an arithmetic number, because the mean of its divisors is an integer number (642739935).

Almost surely, 2^1285479869 is an apocalyptic number.

It is an amenable number.

1285479869 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285479869 is an equidigital number, since it uses as much as digits as its factorization.

1285479869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8709120, while the sum is 59.

The square root of 1285479869 is about 35853.5893461171. The cubic root of 1285479869 is about 1087.3142837662.

The spelling of 1285479869 in words is "one billion, two hundred eighty-five million, four hundred seventy-nine thousand, eight hundred sixty-nine".