1540423561 has 2 divisors, whose sum is σ = 1540423562. Its totient is φ = 1540423560.

The previous prime is 1540423541. The next prime is 1540423583. The reversal of 1540423561 is 1653240451.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1350121536 + 190302025 = 36744^2 + 13795^2 .

It is an emirp because it is prime and its reverse (1653240451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1540423561 - 2¹¹ = 1540421513 is a prime.

It is not a weakly prime, because it can be changed into another prime (1540423501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770211780 + 770211781.

It is an arithmetic number, because the mean of its divisors is an integer number (770211781).

Almost surely, 2^1540423561 is an apocalyptic number.

It is an amenable number.

1540423561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540423561 is an equidigital number, since it uses as much as digits as its factorization.

1540423561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 1540423561 is about 39248.2300365252. The cubic root of 1540423561 is about 1154.9062125328.

The spelling of 1540423561 in words is "one billion, five hundred forty million, four hundred twenty-three thousand, five hundred sixty-one".