211431325 has 18 divisors (see below), whose sum is σ = 304980666. Its totient is φ = 144980640.

The previous prime is 211431317. The next prime is 211431347. The reversal of 211431325 is 523134112.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 2079364 + 209351961 = 1442^2 + 14469^2 .

It is not a de Polignac number, because 211431325 - 2³ = 211431317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211431296 and 211431305.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 85074 + ... + 87523.

Almost surely, 2^211431325 is an apocalyptic number.

211431325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

211431325 is a deficient number, since it is larger than the sum of its proper divisors (93549341).

211431325 is a wasteful number, since it uses less digits than its factorization.

211431325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172621 (or 172609 counting only the distinct ones).

The product of its digits is 720, while the sum is 22.

The square root of 211431325 is about 14540.6782854171. The cubic root of 211431325 is about 595.7395647943.

Adding to 211431325 its reverse (523134112), we get a palindrome (734565437).

The spelling of 211431325 in words is "two hundred eleven million, four hundred thirty-one thousand, three hundred twenty-five".