281628621139 has 4 divisors (see below), whose sum is σ = 281716550856. Its totient is φ = 281540691424.

The previous prime is 281628621137. The next prime is 281628621151. The reversal of 281628621139 is 931126826182.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 281628621139 - 2¹ = 281628621137 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 281628621092 and 281628621101.

It is not an unprimeable number, because it can be changed into a prime (281628621137) 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, 43960054 + ... + 43966459.

It is an arithmetic number, because the mean of its divisors is an integer number (70429137714).

Almost surely, 2^281628621139 is an apocalyptic number.

281628621139 is a deficient number, since it is larger than the sum of its proper divisors (87929717).

281628621139 is an equidigital number, since it uses as much as digits as its factorization.

281628621139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87929716.

The product of its digits is 497664, while the sum is 49.

The spelling of 281628621139 in words is "two hundred eighty-one billion, six hundred twenty-eight million, six hundred twenty-one thousand, one hundred thirty-nine".