1617520249 has 2 divisors, whose sum is σ = 1617520250. Its totient is φ = 1617520248.

The previous prime is 1617520237. The next prime is 1617520253. The reversal of 1617520249 is 9420257161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1605444624 + 12075625 = 40068^2 + 3475^2 .

It is a cyclic number.

It is not a de Polignac number, because 1617520249 - 2¹⁵ = 1617487481 is a prime.

It is not a weakly prime, because it can be changed into another prime (1617520259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 808760124 + 808760125.

It is an arithmetic number, because the mean of its divisors is an integer number (808760125).

Almost surely, 2^1617520249 is an apocalyptic number.

It is an amenable number.

1617520249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1617520249 is an equidigital number, since it uses as much as digits as its factorization.

1617520249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 1617520249 is about 40218.4068431359. The cubic root of 1617520249 is about 1173.8607334314.

The spelling of 1617520249 in words is "one billion, six hundred seventeen million, five hundred twenty thousand, two hundred forty-nine".