125331221 has 2 divisors, whose sum is σ = 125331222. Its totient is φ = 125331220.

The previous prime is 125331181. The next prime is 125331223. The reversal of 125331221 is 122133521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123454321 + 1876900 = 11111^2 + 1370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125331221 is a prime.

Together with 125331223, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 125331193 and 125331202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125331223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62665610 + 62665611.

It is an arithmetic number, because the mean of its divisors is an integer number (62665611).

Almost surely, 2^125331221 is an apocalyptic number.

It is an amenable number.

125331221 is a deficient number, since it is larger than the sum of its proper divisors (1).

125331221 is an equidigital number, since it uses as much as digits as its factorization.

125331221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 20.

The square root of 125331221 is about 11195.1427413857. The cubic root of 125331221 is about 500.4412385026.

Adding to 125331221 its reverse (122133521), we get a palindrome (247464742).

The spelling of 125331221 in words is "one hundred twenty-five million, three hundred thirty-one thousand, two hundred twenty-one".