220661629 has 2 divisors, whose sum is σ = 220661630. Its totient is φ = 220661628.

The previous prime is 220661603. The next prime is 220661647. The reversal of 220661629 is 926166022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 220522500 + 139129 = 14850^2 + 373^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220661629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220661594 and 220661603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220661929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110330814 + 110330815.

It is an arithmetic number, because the mean of its divisors is an integer number (110330815).

Almost surely, 2^220661629 is an apocalyptic number.

It is an amenable number.

220661629 is a deficient number, since it is larger than the sum of its proper divisors (1).

220661629 is an equidigital number, since it uses as much as digits as its factorization.

220661629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 220661629 is about 14854.6837394810. The cubic root of 220661629 is about 604.2856390949.

The spelling of 220661629 in words is "two hundred twenty million, six hundred sixty-one thousand, six hundred twenty-nine".