201691629 has 12 divisors (see below), whose sum is σ = 298108096. Its totient is φ = 131333832.

The previous prime is 201691619. The next prime is 201691643. The reversal of 201691629 is 926196102.

201691629 is a `hidden beast` number, since 20 + 1 + 6 + 9 + 1 + 629 = 666.

It is not a de Polignac number, because 201691629 - 2¹³ = 201683437 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201691593 and 201691602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201691619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 260197 + ... + 260970.

Almost surely, 2^201691629 is an apocalyptic number.

It is an amenable number.

201691629 is a deficient number, since it is larger than the sum of its proper divisors (96416467).

201691629 is a wasteful number, since it uses less digits than its factorization.

201691629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521216 (or 521213 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 201691629 is about 14201.8178061824. The cubic root of 201691629 is about 586.4477052119.

The spelling of 201691629 in words is "two hundred one million, six hundred ninety-one thousand, six hundred twenty-nine".