281157146506721 has 4 divisors (see below), whose sum is σ = 281157322875072. Its totient is φ = 281156970138372.

The previous prime is 281157146506699. The next prime is 281157146506763. The reversal of 281157146506721 is 127605641751182.

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 281157146506721 - 2¹⁸ = 281157146244577 is a prime.

It is a super-2 number, since 2×281157146506721² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (281157146506771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (37) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85770941 + ... + 88988586.

It is an arithmetic number, because the mean of its divisors is an integer number (70289330718768).

Almost surely, 2^{281157146506721} is an apocalyptic number.

It is an amenable number.

281157146506721 is a deficient number, since it is larger than the sum of its proper divisors (176368351).

281157146506721 is a wasteful number, since it uses less digits than its factorization.

281157146506721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176368350.

The product of its (nonzero) digits is 5644800, while the sum is 56.

The spelling of 281157146506721 in words is "two hundred eighty-one trillion, one hundred fifty-seven billion, one hundred forty-six million, five hundred six thousand, seven hundred twenty-one".