1285273123 has 4 divisors (see below), whose sum is σ = 1290051360. Its totient is φ = 1280494888.

The previous prime is 1285273103. The next prime is 1285273133. The reversal of 1285273123 is 3213725821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3213725821 = 32497 ⋅98893.

It is a cyclic number.

It is not a de Polignac number, because 1285273123 - 2¹⁷ = 1285142051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1285273103) 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, 2388715 + ... + 2389252.

It is an arithmetic number, because the mean of its divisors is an integer number (322512840).

Almost surely, 2^1285273123 is an apocalyptic number.

1285273123 is a deficient number, since it is larger than the sum of its proper divisors (4778237).

1285273123 is an equidigital number, since it uses as much as digits as its factorization.

1285273123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4778236.

The product of its digits is 20160, while the sum is 34.

The square root of 1285273123 is about 35850.7060320993. The cubic root of 1285273123 is about 1087.2559890813.

Adding to 1285273123 its reverse (3213725821), we get a palindrome (4498998944).

The spelling of 1285273123 in words is "one billion, two hundred eighty-five million, two hundred seventy-three thousand, one hundred twenty-three".