814948489721 has 4 divisors (see below), whose sum is σ = 815715140352. Its totient is φ = 814181839092.

The previous prime is 814948489703. The next prime is 814948489739. The reversal of 814948489721 is 127984849418.

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 an interprime number because it is at equal distance from previous prime (814948489703) and next prime (814948489739).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-814948489721 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (814948489781) 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, 383323721 + ... + 383325846.

It is an arithmetic number, because the mean of its divisors is an integer number (203928785088).

Almost surely, 2^814948489721 is an apocalyptic number.

It is an amenable number.

814948489721 is a deficient number, since it is larger than the sum of its proper divisors (766650631).

814948489721 is a wasteful number, since it uses less digits than its factorization.

814948489721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766650630.

The product of its digits is 37158912, while the sum is 65.

The spelling of 814948489721 in words is "eight hundred fourteen billion, nine hundred forty-eight million, four hundred eighty-nine thousand, seven hundred twenty-one".