12801539 has 4 divisors (see below), whose sum is σ = 12822840. Its totient is φ = 12780240.

The previous prime is 12801533. The next prime is 12801541. The reversal of 12801539 is 93510821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12801539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12801533) 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, 9722 + ... + 10959.

It is an arithmetic number, because the mean of its divisors is an integer number (3205710).

Almost surely, 2^12801539 is an apocalyptic number.

12801539 is a deficient number, since it is larger than the sum of its proper divisors (21301).

12801539 is an equidigital number, since it uses as much as digits as its factorization.

12801539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21300.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 12801539 is about 3577.9238393236. The cubic root of 12801539 is about 233.9307938132.

The spelling of 12801539 in words is "twelve million, eight hundred one thousand, five hundred thirty-nine".