1998313567 has 2 divisors, whose sum is σ = 1998313568. Its totient is φ = 1998313566.

The previous prime is 1998313553. The next prime is 1998313573. The reversal of 1998313567 is 7653138991.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1998313567 - 2¹¹ = 1998311519 is a prime.

It is a super-2 number, since 2×1998313567² = 7986514224112526978, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1998313267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999156783 + 999156784.

It is an arithmetic number, because the mean of its divisors is an integer number (999156784).

Almost surely, 2^1998313567 is an apocalyptic number.

1998313567 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998313567 is an equidigital number, since it uses as much as digits as its factorization.

1998313567 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1224720, while the sum is 52.

The square root of 1998313567 is about 44702.5006794922. The cubic root of 1998313567 is about 1259.5668215732.

The spelling of 1998313567 in words is "one billion, nine hundred ninety-eight million, three hundred thirteen thousand, five hundred sixty-seven".