211630625 has 10 divisors (see below), whose sum is σ = 264454410. Its totient is φ = 169304000.

The previous prime is 211630621. The next prime is 211630663. The reversal of 211630625 is 526036112.

It can be written as a sum of positive squares in 5 ways, for example, as 26915344 + 184715281 = 5188^2 + 13591^2 .

It is not a de Polignac number, because 211630625 - 2² = 211630621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211630594 and 211630603.

It is not an unprimeable number, because it can be changed into a prime (211630621) 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 9 ways as a sum of consecutive naturals, for example, 168680 + ... + 169929.

It is an arithmetic number, because the mean of its divisors is an integer number (26445441).

Almost surely, 2^211630625 is an apocalyptic number.

211630625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

211630625 is a deficient number, since it is larger than the sum of its proper divisors (52823785).

211630625 is an frugal number, since it uses more digits than its factorization.

211630625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338629 (or 338614 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 211630625 is about 14547.5298590517. The cubic root of 211630625 is about 595.9266919204.

Adding to 211630625 its reverse (526036112), we get a palindrome (737666737).

It can be divided in two parts, 2116 and 30625, that multiplied together give a square (64802500 = 8050²).

The spelling of 211630625 in words is "two hundred eleven million, six hundred thirty thousand, six hundred twenty-five".