1540221011 has 8 divisors (see below), whose sum is σ = 1766262624. Its totient is φ = 1315681920.

The previous prime is 1540220987. The next prime is 1540221017. The reversal of 1540221011 is 1101220451.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1540221011 - 2⁶ = 1540220947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1540221017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 373430 + ... + 377531.

It is an arithmetic number, because the mean of its divisors is an integer number (220782828).

Almost surely, 2^1540221011 is an apocalyptic number.

1540221011 is a deficient number, since it is larger than the sum of its proper divisors (226041613).

1540221011 is an equidigital number, since it uses as much as digits as its factorization.

1540221011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751261.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 1540221011 is about 39245.6495805586. The cubic root of 1540221011 is about 1154.8555908482.

Adding to 1540221011 its reverse (1101220451), we get a palindrome (2641441462).

The spelling of 1540221011 in words is "one billion, five hundred forty million, two hundred twenty-one thousand, eleven".