201501540 has 48 divisors (see below), whose sum is σ = 626895360. Its totient is φ = 53733600.

The previous prime is 201501539. The next prime is 201501563. The reversal of 201501540 is 45105102.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 186036 + ... + 187115.

It is an arithmetic number, because the mean of its divisors is an integer number (13060320).

Almost surely, 2^201501540 is an apocalyptic number.

201501540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201501540 is an abundant number, since it is smaller than the sum of its proper divisors (425393820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201501540 is a wasteful number, since it uses less digits than its factorization.

201501540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373169 (or 373161 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 201501540 is about 14195.1238106612. The cubic root of 201501540 is about 586.2634101766.

Adding to 201501540 its reverse (45105102), we get a palindrome (246606642).

The spelling of 201501540 in words is "two hundred one million, five hundred one thousand, five hundred forty".