281291404681 has 4 divisors (see below), whose sum is σ = 321475891072. Its totient is φ = 241106918292.

The previous prime is 281291404663. The next prime is 281291404699. The reversal of 281291404681 is 186404192182.

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 (281291404663) and next prime (281291404699).

It is a cyclic number.

It is not a de Polignac number, because 281291404681 - 2²⁷ = 281157186953 is a prime.

It is a super-2 number, since 2×281291404681² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (281291404181) 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, 20092243185 + ... + 20092243198.

It is an arithmetic number, because the mean of its divisors is an integer number (80368972768).

Almost surely, 2^281291404681 is an apocalyptic number.

It is an amenable number.

281291404681 is a deficient number, since it is larger than the sum of its proper divisors (40184486391).

281291404681 is an equidigital number, since it uses as much as digits as its factorization.

281291404681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40184486390.

The product of its (nonzero) digits is 221184, while the sum is 46.

The spelling of 281291404681 in words is "two hundred eighty-one billion, two hundred ninety-one million, four hundred four thousand, six hundred eighty-one".