1540542813 has 4 divisors (see below), whose sum is σ = 2054057088. Its totient is φ = 1027028540.

The previous prime is 1540542793. The next prime is 1540542823. The reversal of 1540542813 is 3182450451.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1540542813 - 2⁶ = 1540542749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540542823) 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, 256757133 + ... + 256757138.

It is an arithmetic number, because the mean of its divisors is an integer number (513514272).

Almost surely, 2^1540542813 is an apocalyptic number.

It is an amenable number.

1540542813 is a deficient number, since it is larger than the sum of its proper divisors (513514275).

1540542813 is an equidigital number, since it uses as much as digits as its factorization.

1540542813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513514274.

The product of its (nonzero) digits is 19200, while the sum is 33.

The square root of 1540542813 is about 39249.7492093899. The cubic root of 1540542813 is about 1154.9360141461.

The spelling of 1540542813 in words is "one billion, five hundred forty million, five hundred forty-two thousand, eight hundred thirteen".