1988817601 has 2 divisors, whose sum is σ = 1988817602. Its totient is φ = 1988817600.

The previous prime is 1988817583. The next prime is 1988817671. The reversal of 1988817601 is 1067188891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1888337025 + 100480576 = 43455^2 + 10024^2 .

It is a cyclic number.

It is not a de Polignac number, because 1988817601 - 2¹⁷ = 1988686529 is a prime.

It is not a weakly prime, because it can be changed into another prime (1988817671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994408800 + 994408801.

It is an arithmetic number, because the mean of its divisors is an integer number (994408801).

Almost surely, 2^1988817601 is an apocalyptic number.

It is an amenable number.

1988817601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1988817601 is an equidigital number, since it uses as much as digits as its factorization.

1988817601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 49.

The square root of 1988817601 is about 44596.1612809892. The cubic root of 1988817601 is about 1257.5685032646.

The spelling of 1988817601 in words is "one billion, nine hundred eighty-eight million, eight hundred seventeen thousand, six hundred one".