252302781 has 4 divisors (see below), whose sum is σ = 336403712. Its totient is φ = 168201852.

The previous prime is 252302779. The next prime is 252302789. The reversal of 252302781 is 187203252.

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 252302781 - 2¹ = 252302779 is a prime.

It is a super-2 number, since 2×252302781² = 127313386600667922, 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 (252302789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42050461 + ... + 42050466.

It is an arithmetic number, because the mean of its divisors is an integer number (84100928).

Almost surely, 2^252302781 is an apocalyptic number.

It is an amenable number.

252302781 is a deficient number, since it is larger than the sum of its proper divisors (84100931).

252302781 is an equidigital number, since it uses as much as digits as its factorization.

252302781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84100930.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 252302781 is about 15884.0417085829. The cubic root of 252302781 is about 631.8888312250. Note that the first 4 decimals are identical.

The spelling of 252302781 in words is "two hundred fifty-two million, three hundred two thousand, seven hundred eighty-one".