1540221017 has 2 divisors, whose sum is σ = 1540221018. Its totient is φ = 1540221016.

The previous prime is 1540220987. The next prime is 1540221031. The reversal of 1540221017 is 7101220451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1194670096 + 345550921 = 34564^2 + 18589^2 .

It is a cyclic number.

It is not a de Polignac number, because 1540221017 - 2⁶ = 1540220953 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1540220983 and 1540221001.

It is not a weakly prime, because it can be changed into another prime (1540221037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770110508 + 770110509.

It is an arithmetic number, because the mean of its divisors is an integer number (770110509).

Almost surely, 2^1540221017 is an apocalyptic number.

It is an amenable number.

1540221017 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540221017 is an equidigital number, since it uses as much as digits as its factorization.

1540221017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 1540221017 is about 39245.6496570002. The cubic root of 1540221017 is about 1154.8555923478.

Adding to 1540221017 its reverse (7101220451), we get a palindrome (8641441468).

The spelling of 1540221017 in words is "one billion, five hundred forty million, two hundred twenty-one thousand, seventeen".