1998870701 has 2 divisors, whose sum is σ = 1998870702. Its totient is φ = 1998870700.

The previous prime is 1998870641. The next prime is 1998870751. The reversal of 1998870701 is 1070788991.

It is an a-pointer prime, because the next prime (1998870751) can be obtained adding 1998870701 to its sum of digits (50).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1077808900 + 921061801 = 32830^2 + 30349^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1998870701 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1998870701.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1998870751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999435350 + 999435351.

It is an arithmetic number, because the mean of its divisors is an integer number (999435351).

Almost surely, 2^1998870701 is an apocalyptic number.

It is an amenable number.

1998870701 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998870701 is an equidigital number, since it uses as much as digits as its factorization.

1998870701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 50.

The square root of 1998870701 is about 44708.7318205292. The cubic root of 1998870701 is about 1259.6838673173.

The spelling of 1998870701 in words is "one billion, nine hundred ninety-eight million, eight hundred seventy thousand, seven hundred one".