281165905121 has 2 divisors, whose sum is σ = 281165905122. Its totient is φ = 281165905120.

The previous prime is 281165905067. The next prime is 281165905169. The reversal of 281165905121 is 121509561182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193881702400 + 87284202721 = 440320^2 + 295439^2 .

It is a cyclic number.

It is not a de Polignac number, because 281165905121 - 2³⁸ = 6287998177 is a prime.

It is a super-2 number, since 2×281165905121² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (281165505121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140582952560 + 140582952561.

It is an arithmetic number, because the mean of its divisors is an integer number (140582952561).

Almost surely, 2^281165905121 is an apocalyptic number.

It is an amenable number.

281165905121 is a deficient number, since it is larger than the sum of its proper divisors (1).

281165905121 is an equidigital number, since it uses as much as digits as its factorization.

281165905121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 41.

The spelling of 281165905121 in words is "two hundred eighty-one billion, one hundred sixty-five million, nine hundred five thousand, one hundred twenty-one".