1998313573 has 2 divisors, whose sum is σ = 1998313574. Its totient is φ = 1998313572.

The previous prime is 1998313567. The next prime is 1998313589. The reversal of 1998313573 is 3753138991.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1237491684 + 760821889 = 35178^2 + 27583^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1998313573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1998313553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999156786 + 999156787.

It is an arithmetic number, because the mean of its divisors is an integer number (999156787).

Almost surely, 2^1998313573 is an apocalyptic number.

It is an amenable number.

1998313573 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998313573 is an equidigital number, since it uses as much as digits as its factorization.

1998313573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 612360, while the sum is 49.

The square root of 1998313573 is about 44702.5007466025. The cubic root of 1998313573 is about 1259.5668228338.

The spelling of 1998313573 in words is "one billion, nine hundred ninety-eight million, three hundred thirteen thousand, five hundred seventy-three".