201261439 has 4 divisors (see below), whose sum is σ = 202125456. Its totient is φ = 200397424.

The previous prime is 201261413. The next prime is 201261443. The reversal of 201261439 is 934162102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 201261439 - 2¹⁷ = 201130367 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 (201261469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 431659 + ... + 432124.

It is an arithmetic number, because the mean of its divisors is an integer number (50531364).

Almost surely, 2^201261439 is an apocalyptic number.

201261439 is a deficient number, since it is larger than the sum of its proper divisors (864017).

201261439 is an equidigital number, since it uses as much as digits as its factorization.

201261439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864016.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 201261439 is about 14186.6641251564. The cubic root of 201261439 is about 586.0304617882.

The spelling of 201261439 in words is "two hundred one million, two hundred sixty-one thousand, four hundred thirty-nine".