213761225 has 6 divisors (see below), whose sum is σ = 265063950. Its totient is φ = 171008960.

The previous prime is 213761221. The next prime is 213761227. The reversal of 213761225 is 522167312.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 36445369 + 177315856 = 6037^2 + 13316^2 .

It is not a de Polignac number, because 213761225 - 2² = 213761221 is a prime.

It is a super-2 number, since 2×213761225² = 91387722627001250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (213761221) 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 5 ways as a sum of consecutive naturals, for example, 4275200 + ... + 4275249.

It is an arithmetic number, because the mean of its divisors is an integer number (44177325).

Almost surely, 2^213761225 is an apocalyptic number.

213761225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

213761225 is a deficient number, since it is larger than the sum of its proper divisors (51302725).

213761225 is an equidigital number, since it uses as much as digits as its factorization.

213761225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8550459 (or 8550454 counting only the distinct ones).

The product of its digits is 5040, while the sum is 29.

The square root of 213761225 is about 14620.5753990737. The cubic root of 213761225 is about 597.9198568601.

The spelling of 213761225 in words is "two hundred thirteen million, seven hundred sixty-one thousand, two hundred twenty-five".