1988190811 has 2 divisors, whose sum is σ = 1988190812. Its totient is φ = 1988190810.

The previous prime is 1988190793. The next prime is 1988190823. The reversal of 1988190811 is 1180918891.

It is a strong prime.

It is an emirp because it is prime and its reverse (1180918891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1988190811 - 2⁵ = 1988190779 is a prime.

It is not a weakly prime, because it can be changed into another prime (1988110811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994095405 + 994095406.

It is an arithmetic number, because the mean of its divisors is an integer number (994095406).

Almost surely, 2^1988190811 is an apocalyptic number.

1988190811 is a deficient number, since it is larger than the sum of its proper divisors (1).

1988190811 is an equidigital number, since it uses as much as digits as its factorization.

1988190811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 46.

The square root of 1988190811 is about 44589.1333286486. The cubic root of 1988190811 is about 1257.4363788335.

The spelling of 1988190811 in words is "one billion, nine hundred eighty-eight million, one hundred ninety thousand, eight hundred eleven".