213556825 has 6 divisors (see below), whose sum is σ = 264810494. Its totient is φ = 170845440.

The previous prime is 213556807. The next prime is 213556831. The reversal of 213556825 is 528655312.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 484416 + 213072409 = 696^2 + 14597^2 .

It is not a de Polignac number, because 213556825 - 2⁵ = 213556793 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4271112 + ... + 4271161.

Almost surely, 2^213556825 is an apocalyptic number.

213556825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

213556825 is a deficient number, since it is larger than the sum of its proper divisors (51253669).

213556825 is an equidigital number, since it uses as much as digits as its factorization.

213556825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8542283 (or 8542278 counting only the distinct ones).

The product of its digits is 72000, while the sum is 37.

The square root of 213556825 is about 14613.5835783014. The cubic root of 213556825 is about 597.7292176805.

The spelling of 213556825 in words is "two hundred thirteen million, five hundred fifty-six thousand, eight hundred twenty-five".