998887597 has 2 divisors, whose sum is σ = 998887598. Its totient is φ = 998887596.

The previous prime is 998887583. The next prime is 998887601. The reversal of 998887597 is 795788899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 997675396 + 1212201 = 31586^2 + 1101^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998887597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998887567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499443798 + 499443799.

It is an arithmetic number, because the mean of its divisors is an integer number (499443799).

Almost surely, 2^998887597 is an apocalyptic number.

It is an amenable number.

998887597 is a deficient number, since it is larger than the sum of its proper divisors (1).

998887597 is an equidigital number, since it uses as much as digits as its factorization.

998887597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 91445760, while the sum is 70.

The square root of 998887597 is about 31605.1830717685. The cubic root of 998887597 is about 999.6290614216.

The spelling of 998887597 in words is "nine hundred ninety-eight million, eight hundred eighty-seven thousand, five hundred ninety-seven".