201639629 has 2 divisors, whose sum is σ = 201639630. Its totient is φ = 201639628.

The previous prime is 201639617. The next prime is 201639721. The reversal of 201639629 is 926936102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153016900 + 48622729 = 12370^2 + 6973^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201639629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201639592 and 201639601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201639029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100819814 + 100819815.

It is an arithmetic number, because the mean of its divisors is an integer number (100819815).

Almost surely, 2^201639629 is an apocalyptic number.

It is an amenable number.

201639629 is a deficient number, since it is larger than the sum of its proper divisors (1).

201639629 is an equidigital number, since it uses as much as digits as its factorization.

201639629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 201639629 is about 14199.9869366137. The cubic root of 201639629 is about 586.3973016958.

It can be divided in two parts, 20163 and 9629, that added together give a palindrome (29792).

The spelling of 201639629 in words is "two hundred one million, six hundred thirty-nine thousand, six hundred twenty-nine".