12820512949 has 4 divisors (see below), whose sum is σ = 12821778720. Its totient is φ = 12819247180.

The previous prime is 12820512899. The next prime is 12820512953. The reversal of 12820512949 is 94921502821.

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 not a de Polignac number, because 12820512949 - 2⁹ = 12820512437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12820512149) 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, 617569 + ... + 637990.

It is an arithmetic number, because the mean of its divisors is an integer number (3205444680).

Almost surely, 2^12820512949 is an apocalyptic number.

It is an amenable number.

12820512949 is a deficient number, since it is larger than the sum of its proper divisors (1265771).

12820512949 is a wasteful number, since it uses less digits than its factorization.

12820512949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1265770.

The product of its (nonzero) digits is 103680, while the sum is 43.

The spelling of 12820512949 in words is "twelve billion, eight hundred twenty million, five hundred twelve thousand, nine hundred forty-nine".