20111171629 has 2 divisors, whose sum is σ = 20111171630. Its totient is φ = 20111171628.

The previous prime is 20111171603. The next prime is 20111171671. The reversal of 20111171629 is 92617111102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15104901604 + 5006270025 = 122902^2 + 70755^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111171629 - 2⁷ = 20111171501 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20111171629.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20111171429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055585814 + 10055585815.

It is an arithmetic number, because the mean of its divisors is an integer number (10055585815).

Almost surely, 2^20111171629 is an apocalyptic number.

It is an amenable number.

20111171629 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111171629 is an equidigital number, since it uses as much as digits as its factorization.

20111171629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 31.

The spelling of 20111171629 in words is "twenty billion, one hundred eleven million, one hundred seventy-one thousand, six hundred twenty-nine".