1540367321 has 2 divisors, whose sum is σ = 1540367322. Its totient is φ = 1540367320.

The previous prime is 1540367317. The next prime is 1540367329. The reversal of 1540367321 is 1237630451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1441265296 + 99102025 = 37964^2 + 9955^2 .

It is an emirp because it is prime and its reverse (1237630451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1540367321 - 2² = 1540367317 is a prime.

It is not a weakly prime, because it can be changed into another prime (1540367329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770183660 + 770183661.

It is an arithmetic number, because the mean of its divisors is an integer number (770183661).

Almost surely, 2^1540367321 is an apocalyptic number.

It is an amenable number.

1540367321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540367321 is an equidigital number, since it uses as much as digits as its factorization.

1540367321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 1540367321 is about 39247.5135645559. The cubic root of 1540367321 is about 1154.8921573692.

Adding to 1540367321 its reverse (1237630451), we get a palindrome (2777997772).

The spelling of 1540367321 in words is "one billion, five hundred forty million, three hundred sixty-seven thousand, three hundred twenty-one".