281479271678921 has 2 divisors, whose sum is σ = 281479271678922. Its totient is φ = 281479271678920.

The previous prime is 281479271678911. The next prime is 281479271678933. The reversal of 281479271678921 is 129876172974182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 253180446606025 + 28298825072896 = 15911645^2 + 5319664^2 .

It is a cyclic number.

It is not a de Polignac number, because 281479271678921 - 2²² = 281479267484617 is a prime.

It is not a weakly prime, because it can be changed into another prime (281479271678911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140739635839460 + 140739635839461.

It is an arithmetic number, because the mean of its divisors is an integer number (140739635839461).

Almost surely, 2^{281479271678921} is an apocalyptic number.

It is an amenable number.

281479271678921 is a deficient number, since it is larger than the sum of its proper divisors (1).

281479271678921 is an equidigital number, since it uses as much as digits as its factorization.

281479271678921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 341397504, while the sum is 74.

The spelling of 281479271678921 in words is "two hundred eighty-one trillion, four hundred seventy-nine billion, two hundred seventy-one million, six hundred seventy-eight thousand, nine hundred twenty-one".