1988069191 has 2 divisors, whose sum is σ = 1988069192. Its totient is φ = 1988069190.

The previous prime is 1988069183. The next prime is 1988069197. The reversal of 1988069191 is 1919608891.

It is a strong prime.

It is an emirp because it is prime and its reverse (1919608891) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1616908861 and 1688096161.

It is a cyclic number.

It is not a de Polignac number, because 1988069191 - 2³ = 1988069183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1988069197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994034595 + 994034596.

It is an arithmetic number, because the mean of its divisors is an integer number (994034596).

Almost surely, 2^1988069191 is an apocalyptic number.

1988069191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1988069191 is an equidigital number, since it uses as much as digits as its factorization.

1988069191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 52.

The square root of 1988069191 is about 44587.7695225944. The cubic root of 1988069191 is about 1257.4107386837.

The spelling of 1988069191 in words is "one billion, nine hundred eighty-eight million, sixty-nine thousand, one hundred ninety-one".