812047939949 has 4 divisors (see below), whose sum is σ = 812049920640. Its totient is φ = 812045959260.

The previous prime is 812047939939. The next prime is 812047939951. The reversal of 812047939949 is 949939740218.

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-812047939949 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 (812047939939) 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, 120989 + ... + 1280130.

It is an arithmetic number, because the mean of its divisors is an integer number (203012480160).

Almost surely, 2^812047939949 is an apocalyptic number.

It is an amenable number.

812047939949 is a deficient number, since it is larger than the sum of its proper divisors (1980691).

812047939949 is a wasteful number, since it uses less digits than its factorization.

812047939949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1980690.

The product of its (nonzero) digits is 35271936, while the sum is 65.

The spelling of 812047939949 in words is "eight hundred twelve billion, forty-seven million, nine hundred thirty-nine thousand, nine hundred forty-nine".