201518139 has 16 divisors (see below), whose sum is σ = 271687680. Its totient is φ = 132854400.

The previous prime is 201518113. The next prime is 201518147. The reversal of 201518139 is 931815102.

It is a de Polignac number, because none of the positive numbers 2^k-201518139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201518159) 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, 152122 + ... + 153440.

It is an arithmetic number, because the mean of its divisors is an integer number (16980480).

Almost surely, 2^201518139 is an apocalyptic number.

201518139 is a deficient number, since it is larger than the sum of its proper divisors (70169541).

201518139 is a wasteful number, since it uses less digits than its factorization.

201518139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1850.

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 201518139 is about 14195.7084712247. The cubic root of 201518139 is about 586.2795078520.

The spelling of 201518139 in words is "two hundred one million, five hundred eighteen thousand, one hundred thirty-nine".