201625391 has 16 divisors (see below), whose sum is σ = 223198848. Its totient is φ = 180612000.

The previous prime is 201625381. The next prime is 201625393. The reversal of 201625391 is 193526102.

It is a cyclic number.

It is not a de Polignac number, because 201625391 - 2²⁶ = 134516527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201625393) 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 15 ways as a sum of consecutive naturals, for example, 385256 + ... + 385778.

It is an arithmetic number, because the mean of its divisors is an integer number (13949928).

Almost surely, 2^201625391 is an apocalyptic number.

201625391 is a deficient number, since it is larger than the sum of its proper divisors (21573457).

201625391 is a wasteful number, since it uses less digits than its factorization.

201625391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 201625391 is about 14199.4855892740. The cubic root of 201625391 is about 586.3834993142.

The spelling of 201625391 in words is "two hundred one million, six hundred twenty-five thousand, three hundred ninety-one".