1540798291 has 2 divisors, whose sum is σ = 1540798292. Its totient is φ = 1540798290.

The previous prime is 1540798283. The next prime is 1540798307. The reversal of 1540798291 is 1928970451.

It is a weak prime.

It is an emirp because it is prime and its reverse (1928970451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1540798291 - 2³ = 1540798283 is a prime.

It is not a weakly prime, because it can be changed into another prime (1540798211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770399145 + 770399146.

It is an arithmetic number, because the mean of its divisors is an integer number (770399146).

Almost surely, 2^1540798291 is an apocalyptic number.

1540798291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540798291 is an equidigital number, since it uses as much as digits as its factorization.

1540798291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 46.

The square root of 1540798291 is about 39253.0035920820. The cubic root of 1540798291 is about 1154.9998540757. Note that the first 3 decimals are identical.

The spelling of 1540798291 in words is "one billion, five hundred forty million, seven hundred ninety-eight thousand, two hundred ninety-one".