1540261013 has 4 divisors (see below), whose sum is σ = 1630864620. Its totient is φ = 1449657408.

The previous prime is 1540261001. The next prime is 1540261103. The reversal of 1540261013 is 3101620451.

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 1263304849 + 276956164 = 35543^2 + 16642^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1540261013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1540261013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540261313) 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, 45301778 + ... + 45301811.

It is an arithmetic number, because the mean of its divisors is an integer number (407716155).

Almost surely, 2^1540261013 is an apocalyptic number.

It is an amenable number.

1540261013 is a deficient number, since it is larger than the sum of its proper divisors (90603607).

1540261013 is an equidigital number, since it uses as much as digits as its factorization.

1540261013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90603606.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1540261013 is about 39246.1592133549. The cubic root of 1540261013 is about 1154.8655885765.

Adding to 1540261013 its reverse (3101620451), we get a palindrome (4641881464).

The spelling of 1540261013 in words is "one billion, five hundred forty million, two hundred sixty-one thousand, thirteen".