1598220991 has 2 divisors, whose sum is σ = 1598220992. Its totient is φ = 1598220990.

The previous prime is 1598220979. The next prime is 1598221003. The reversal of 1598220991 is 1990228951.

It is a balanced prime because it is at equal distance from previous prime (1598220979) and next prime (1598221003).

It is an emirp because it is prime and its reverse (1990228951) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1598220991 - 2¹⁷ = 1598089919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1598220931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 799110495 + 799110496.

It is an arithmetic number, because the mean of its divisors is an integer number (799110496).

Almost surely, 2^1598220991 is an apocalyptic number.

1598220991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1598220991 is an equidigital number, since it uses as much as digits as its factorization.

1598220991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 46.

The square root of 1598220991 is about 39977.7562026685. The cubic root of 1598220991 is about 1169.1734467009.

The spelling of 1598220991 in words is "one billion, five hundred ninety-eight million, two hundred twenty thousand, nine hundred ninety-one".