213944825 has 6 divisors (see below), whose sum is σ = 265291614. Its totient is φ = 171155840.

The previous prime is 213944777. The next prime is 213944831. The reversal of 213944825 is 528449312.

It can be written as a sum of positive squares in 3 ways, for example, as 434281 + 213510544 = 659^2 + 14612^2 .

It is not a de Polignac number, because 213944825 - 2⁶ = 213944761 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 4278872 + ... + 4278921.

It is an arithmetic number, because the mean of its divisors is an integer number (44215269).

Almost surely, 2^213944825 is an apocalyptic number.

213944825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

213944825 is a deficient number, since it is larger than the sum of its proper divisors (51346789).

213944825 is an equidigital number, since it uses as much as digits as its factorization.

213944825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8557803 (or 8557798 counting only the distinct ones).

The product of its digits is 69120, while the sum is 38.

The square root of 213944825 is about 14626.8528740806. The cubic root of 213944825 is about 598.0909927792.

It can be divided in two parts, 2139 and 44825, that added together give a palindrome (46964).

The spelling of 213944825 in words is "two hundred thirteen million, nine hundred forty-four thousand, eight hundred twenty-five".