1540316849 has 4 divisors (see below), whose sum is σ = 1541115636. Its totient is φ = 1539518064.

The previous prime is 1540316839. The next prime is 1540316857. The reversal of 1540316849 is 9486130451.

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 566440000 + 973876849 = 23800^2 + 31207^2 .

It is a cyclic number.

It is not a de Polignac number, because 1540316849 - 2⁸ = 1540316593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1540316819) 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, 396494 + ... + 400359.

It is an arithmetic number, because the mean of its divisors is an integer number (385278909).

Almost surely, 2^1540316849 is an apocalyptic number.

It is an amenable number.

1540316849 is a deficient number, since it is larger than the sum of its proper divisors (798787).

1540316849 is an equidigital number, since it uses as much as digits as its factorization.

1540316849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798786.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 1540316849 is about 39246.8705631417. The cubic root of 1540316849 is about 1154.8795434182.

The spelling of 1540316849 in words is "one billion, five hundred forty million, three hundred sixteen thousand, eight hundred forty-nine".