1617561389 has 2 divisors, whose sum is σ = 1617561390. Its totient is φ = 1617561388.

The previous prime is 1617561317. The next prime is 1617561403. The reversal of 1617561389 is 9831657161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1616442025 + 1119364 = 40205^2 + 1058^2 .

It is a cyclic number.

It is not a de Polignac number, because 1617561389 - 2⁸ = 1617561133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1617161389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 808780694 + 808780695.

It is an arithmetic number, because the mean of its divisors is an integer number (808780695).

Almost surely, 2^1617561389 is an apocalyptic number.

It is an amenable number.

1617561389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1617561389 is an equidigital number, since it uses as much as digits as its factorization.

1617561389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 47.

The square root of 1617561389 is about 40218.9182972392. The cubic root of 1617561389 is about 1173.8706853360.

The spelling of 1617561389 in words is "one billion, six hundred seventeen million, five hundred sixty-one thousand, three hundred eighty-nine".