275120981 has 2 divisors, whose sum is σ = 275120982. Its totient is φ = 275120980.

The previous prime is 275120957. The next prime is 275121023. The reversal of 275120981 is 189021572.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 244140625 + 30980356 = 15625^2 + 5566^2 .

It is a cyclic number.

It is not a de Polignac number, because 275120981 - 2²⁶ = 208012117 is a prime.

It is a super-2 number, since 2×275120981² = 151383108372804722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (275170981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137560490 + 137560491.

It is an arithmetic number, because the mean of its divisors is an integer number (137560491).

Almost surely, 2^275120981 is an apocalyptic number.

It is an amenable number.

275120981 is a deficient number, since it is larger than the sum of its proper divisors (1).

275120981 is an equidigital number, since it uses as much as digits as its factorization.

275120981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 275120981 is about 16586.7712650775. The cubic root of 275120981 is about 650.3910711745.

It can be divided in two parts, 2751 and 20981, that added together give a palindrome (23732).

The spelling of 275120981 in words is "two hundred seventy-five million, one hundred twenty thousand, nine hundred eighty-one".