1285873461 has 10 divisors (see below), whose sum is σ = 1920872822. Its totient is φ = 857248920.

The previous prime is 1285873429. The next prime is 1285873481. The reversal of 1285873461 is 1643785821.

1285873461 is a `hidden beast` number, since 1 + 2 + 8 + 587 + 3 + 4 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1020802500 + 265070961 = 31950^2 + 16281^2 .

It is not a de Polignac number, because 1285873461 - 2⁵ = 1285873429 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285873481) 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 in 9 ways as a sum of consecutive naturals, for example, 7937410 + ... + 7937571.

Almost surely, 2^1285873461 is an apocalyptic number.

It is an amenable number.

1285873461 is a deficient number, since it is larger than the sum of its proper divisors (634999361).

1285873461 is an equidigital number, since it uses as much as digits as its factorization.

1285873461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15874993 (or 15874984 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 1285873461 is about 35859.0778046508. The cubic root of 1285873461 is about 1087.4252448020.

The spelling of 1285873461 in words is "one billion, two hundred eighty-five million, eight hundred seventy-three thousand, four hundred sixty-one".