275252781 has 4 divisors (see below), whose sum is σ = 367003712. Its totient is φ = 183501852.

The previous prime is 275252777. The next prime is 275252837. The reversal of 275252781 is 187252572.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 275252781 - 2² = 275252777 is a prime.

It is a super-2 number, since 2×275252781² = 151528186896467922, 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 (275252701) 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, 45875461 + ... + 45875466.

It is an arithmetic number, because the mean of its divisors is an integer number (91750928).

Almost surely, 2^275252781 is an apocalyptic number.

It is an amenable number.

275252781 is a deficient number, since it is larger than the sum of its proper divisors (91750931).

275252781 is an equidigital number, since it uses as much as digits as its factorization.

275252781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91750930.

The product of its digits is 78400, while the sum is 39.

The square root of 275252781 is about 16590.7438350425. The cubic root of 275252781 is about 650.4949138039.

The spelling of 275252781 in words is "two hundred seventy-five million, two hundred fifty-two thousand, seven hundred eighty-one".