1500540221 has 4 divisors (see below), whose sum is σ = 1513819452. Its totient is φ = 1487260992.

The previous prime is 1500540203. The next prime is 1500540259. The reversal of 1500540221 is 1220450051.

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

It can be written as a sum of positive squares in 2 ways, for example, as 551592196 + 948948025 = 23486^2 + 30805^2 .

It is a cyclic number.

It is not a de Polignac number, because 1500540221 - 2⁶ = 1500540157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1500540193 and 1500540202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1500540421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6639446 + ... + 6639671.

It is an arithmetic number, because the mean of its divisors is an integer number (378454863).

Almost surely, 2^1500540221 is an apocalyptic number.

It is an amenable number.

1500540221 is a deficient number, since it is larger than the sum of its proper divisors (13279231).

1500540221 is a wasteful number, since it uses less digits than its factorization.

1500540221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13279230.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 1500540221 is about 38736.8070573712. The cubic root of 1500540221 is about 1144.8516479865.

Adding to 1500540221 its reverse (1220450051), we get a palindrome (2720990272).

The spelling of 1500540221 in words is "one billion, five hundred million, five hundred forty thousand, two hundred twenty-one".