1285153923 has 4 divisors (see below), whose sum is σ = 1713538568. Its totient is φ = 856769280.

The previous prime is 1285153843. The next prime is 1285153993. The reversal of 1285153923 is 3293515821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3293515821 = 3 ⋅1097838607.

It is not a de Polignac number, because 1285153923 - 2²² = 1280959619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1285153993) 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, 214192318 + ... + 214192323.

It is an arithmetic number, because the mean of its divisors is an integer number (428384642).

Almost surely, 2^1285153923 is an apocalyptic number.

1285153923 is a deficient number, since it is larger than the sum of its proper divisors (428384645).

1285153923 is an equidigital number, since it uses as much as digits as its factorization.

1285153923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428384644.

The product of its digits is 64800, while the sum is 39.

The square root of 1285153923 is about 35849.0435437265. The cubic root of 1285153923 is about 1087.2223762722. Note that the first 3 decimals are identical.

The spelling of 1285153923 in words is "one billion, two hundred eighty-five million, one hundred fifty-three thousand, nine hundred twenty-three".