1285123241 has 4 divisors (see below), whose sum is σ = 1315009872. Its totient is φ = 1255236612.

The previous prime is 1285123223. The next prime is 1285123253. The reversal of 1285123241 is 1423215821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1285123241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1285123201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14943251 + ... + 14943336.

It is an arithmetic number, because the mean of its divisors is an integer number (328752468).

Almost surely, 2^1285123241 is an apocalyptic number.

It is an amenable number.

1285123241 is a deficient number, since it is larger than the sum of its proper divisors (29886631).

1285123241 is an equidigital number, since it uses as much as digits as its factorization.

1285123241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29886630.

The product of its digits is 3840, while the sum is 29.

The square root of 1285123241 is about 35848.6156078586. The cubic root of 1285123241 is about 1087.2137240213.

The spelling of 1285123241 in words is "one billion, two hundred eighty-five million, one hundred twenty-three thousand, two hundred forty-one".