252781781 has 16 divisors (see below), whose sum is σ = 298982400. Its totient is φ = 209139840.

The previous prime is 252781759. The next prime is 252781801. The reversal of 252781781 is 187187252.

It is not a de Polignac number, because 252781781 - 2⁶ = 252781717 is a prime.

It is a super-2 number, since 2×252781781² = 127797257611063922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252781741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97895 + ... + 100443.

It is an arithmetic number, because the mean of its divisors is an integer number (18686400).

Almost surely, 2^252781781 is an apocalyptic number.

It is an amenable number.

252781781 is a deficient number, since it is larger than the sum of its proper divisors (46200619).

252781781 is a wasteful number, since it uses less digits than its factorization.

252781781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3044.

The product of its digits is 62720, while the sum is 41.

The square root of 252781781 is about 15899.1125852986. The cubic root of 252781781 is about 632.2884613926.

The spelling of 252781781 in words is "two hundred fifty-two million, seven hundred eighty-one thousand, seven hundred eighty-one".