1988847197 has 2 divisors, whose sum is σ = 1988847198. Its totient is φ = 1988847196.

The previous prime is 1988847169. The next prime is 1988847209. The reversal of 1988847197 is 7917488891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1289456281 + 699390916 = 35909^2 + 26446^2 .

It is a cyclic number.

It is not a de Polignac number, because 1988847197 - 2¹⁰ = 1988846173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1988847127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994423598 + 994423599.

It is an arithmetic number, because the mean of its divisors is an integer number (994423599).

Almost surely, 2^1988847197 is an apocalyptic number.

It is an amenable number.

1988847197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1988847197 is an equidigital number, since it uses as much as digits as its factorization.

1988847197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8128512, while the sum is 62.

The square root of 1988847197 is about 44596.4931020366. The cubic root of 1988847197 is about 1257.5747412781.

The spelling of 1988847197 in words is "one billion, nine hundred eighty-eight million, eight hundred forty-seven thousand, one hundred ninety-seven".