814724729281 has 4 divisors (see below), whose sum is σ = 814851030064. Its totient is φ = 814598428500.

The previous prime is 814724729267. The next prime is 814724729321. The reversal of 814724729281 is 182927427418.

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, and also an emirpimes, since its reverse is a distinct semiprime: 182927427418 = 2 ⋅91463713709.

It is a cyclic number.

It is not a de Polignac number, because 814724729281 - 2¹³ = 814724721089 is a prime.

It is a super-2 number, since 2×814724729281² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (814724721281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63140715 + ... + 63153616.

It is an arithmetic number, because the mean of its divisors is an integer number (203712757516).

Almost surely, 2^814724729281 is an apocalyptic number.

It is an amenable number.

814724729281 is a deficient number, since it is larger than the sum of its proper divisors (126300783).

814724729281 is a wasteful number, since it uses less digits than its factorization.

814724729281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126300782.

The product of its digits is 3612672, while the sum is 55.

The spelling of 814724729281 in words is "eight hundred fourteen billion, seven hundred twenty-four million, seven hundred twenty-nine thousand, two hundred eighty-one".