221631629 has 2 divisors, whose sum is σ = 221631630. Its totient is φ = 221631628.

The previous prime is 221631593. The next prime is 221631643. The reversal of 221631629 is 926136122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200222500 + 21409129 = 14150^2 + 4627^2 .

It is a cyclic number.

It is not a de Polignac number, because 221631629 - 2⁸ = 221631373 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221631595 and 221631604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221636629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110815814 + 110815815.

It is an arithmetic number, because the mean of its divisors is an integer number (110815815).

Almost surely, 2^221631629 is an apocalyptic number.

It is an amenable number.

221631629 is a deficient number, since it is larger than the sum of its proper divisors (1).

221631629 is an equidigital number, since it uses as much as digits as its factorization.

221631629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 32.

The square root of 221631629 is about 14887.2975720915. The cubic root of 221631629 is about 605.1697986620.

The spelling of 221631629 in words is "two hundred twenty-one million, six hundred thirty-one thousand, six hundred twenty-nine".