201081539 has 4 divisors (see below), whose sum is σ = 204082824. Its totient is φ = 198080256.

The previous prime is 201081509. The next prime is 201081547. The reversal of 201081539 is 935180102.

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 201081539 - 2¹⁶ = 201016003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201081509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1500542 + ... + 1500675.

It is an arithmetic number, because the mean of its divisors is an integer number (51020706).

Almost surely, 2^201081539 is an apocalyptic number.

201081539 is a deficient number, since it is larger than the sum of its proper divisors (3001285).

201081539 is an equidigital number, since it uses as much as digits as its factorization.

201081539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3001284.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 201081539 is about 14180.3222459858. The cubic root of 201081539 is about 585.8557995701.

The spelling of 201081539 in words is "two hundred one million, eighty-one thousand, five hundred thirty-nine".