201689397 has 48 divisors (see below), whose sum is σ = 362718720. Its totient is φ = 105152256.

The previous prime is 201689359. The next prime is 201689401. The reversal of 201689397 is 793986102.

It is not a de Polignac number, because 201689397 - 2⁶ = 201689333 is a prime.

It is a super-3 number, since 3×201689397³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201689297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 71508 + ... + 74274.

It is an arithmetic number, because the mean of its divisors is an integer number (7556640).

Almost surely, 2^201689397 is an apocalyptic number.

It is an amenable number.

201689397 is a deficient number, since it is larger than the sum of its proper divisors (161029323).

201689397 is a wasteful number, since it uses less digits than its factorization.

201689397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2882 (or 2879 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 201689397 is about 14201.7392244753. The cubic root of 201689397 is about 586.4455419158.

The spelling of 201689397 in words is "two hundred one million, six hundred eighty-nine thousand, three hundred ninety-seven".