1598988917 has 2 divisors, whose sum is σ = 1598988918. Its totient is φ = 1598988916.

The previous prime is 1598988901. The next prime is 1598988943. The reversal of 1598988917 is 7198898951.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 941630596 + 657358321 = 30686^2 + 25639^2 .

It is a cyclic number.

It is not a de Polignac number, because 1598988917 - 2⁴ = 1598988901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1598988977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 799494458 + 799494459.

It is an arithmetic number, because the mean of its divisors is an integer number (799494459).

Almost surely, 2^1598988917 is an apocalyptic number.

It is an amenable number.

1598988917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1598988917 is an equidigital number, since it uses as much as digits as its factorization.

1598988917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13063680, while the sum is 65.

The square root of 1598988917 is about 39987.3594652110. The cubic root of 1598988917 is about 1169.3606746523.

The spelling of 1598988917 in words is "one billion, five hundred ninety-eight million, nine hundred eighty-eight thousand, nine hundred seventeen".