275693981 has 8 divisors (see below), whose sum is σ = 301977720. Its totient is φ = 250528768.

The previous prime is 275693927. The next prime is 275693989. The reversal of 275693981 is 189396572.

It can be written as a sum of positive squares in 4 ways, for example, as 50993881 + 224700100 = 7141^2 + 14990^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-275693981 is a prime.

It is a super-2 number, since 2×275693981² = 152014342319256722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (275693989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 279116 + ... + 280101.

It is an arithmetic number, because the mean of its divisors is an integer number (37747215).

Almost surely, 2^275693981 is an apocalyptic number.

It is an amenable number.

275693981 is a deficient number, since it is larger than the sum of its proper divisors (26283739).

275693981 is a wasteful number, since it uses less digits than its factorization.

275693981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559263.

The product of its digits is 816480, while the sum is 50.

The square root of 275693981 is about 16604.0350818709. The cubic root of 275693981 is about 650.8422855895.

The spelling of 275693981 in words is "two hundred seventy-five million, six hundred ninety-three thousand, nine hundred eighty-one".