1540248709 has 2 divisors, whose sum is σ = 1540248710. Its totient is φ = 1540248708.

The previous prime is 1540248683. The next prime is 1540248769. The reversal of 1540248709 is 9078420451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1431108900 + 109139809 = 37830^2 + 10447^2 .

It is a cyclic number.

It is not a de Polignac number, because 1540248709 - 2¹¹ = 1540246661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1540248769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770124354 + 770124355.

It is an arithmetic number, because the mean of its divisors is an integer number (770124355).

Almost surely, 2^1540248709 is an apocalyptic number.

It is an amenable number.

1540248709 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540248709 is an equidigital number, since it uses as much as digits as its factorization.

1540248709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 1540248709 is about 39246.0024588492. The cubic root of 1540248709 is about 1154.8625134475.

The spelling of 1540248709 in words is "one billion, five hundred forty million, two hundred forty-eight thousand, seven hundred nine".