1540998617 has 2 divisors, whose sum is σ = 1540998618. Its totient is φ = 1540998616.

The previous prime is 1540998587. The next prime is 1540998631. The reversal of 1540998617 is 7168990451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1282785856 + 258212761 = 35816^2 + 16069^2 .

It is a cyclic number.

It is not a de Polignac number, because 1540998617 - 2¹⁰ = 1540997593 is a prime.

It is a super-3 number, since 3×1540998617³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1540997617) 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, 770499308 + 770499309.

It is an arithmetic number, because the mean of its divisors is an integer number (770499309).

Almost surely, 2^1540998617 is an apocalyptic number.

It is an amenable number.

1540998617 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540998617 is an equidigital number, since it uses as much as digits as its factorization.

1540998617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 50.

The square root of 1540998617 is about 39255.5552374438. Note that the first 3 decimals coincide. The cubic root of 1540998617 is about 1155.0499074529.

The spelling of 1540998617 in words is "one billion, five hundred forty million, nine hundred ninety-eight thousand, six hundred seventeen".