1988229481 has 4 divisors (see below), whose sum is σ = 2272262272. Its totient is φ = 1704196692.

The previous prime is 1988229469. The next prime is 1988229487. The reversal of 1988229481 is 1849228891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1849228891 = 107 ⋅17282513.

It is a cyclic number.

It is not a de Polignac number, because 1988229481 - 2⁵ = 1988229449 is a prime.

It is a super-2 number, since 2×1988229481² = 7906112938235058722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1988229487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142016385 + ... + 142016398.

It is an arithmetic number, because the mean of its divisors is an integer number (568065568).

Almost surely, 2^1988229481 is an apocalyptic number.

It is an amenable number.

1988229481 is a deficient number, since it is larger than the sum of its proper divisors (284032791).

1988229481 is an equidigital number, since it uses as much as digits as its factorization.

1988229481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284032790.

The product of its digits is 663552, while the sum is 52.

The square root of 1988229481 is about 44589.5669523713. The cubic root of 1988229481 is about 1257.4445310942. Note that the first 3 decimals are identical.

The spelling of 1988229481 in words is "one billion, nine hundred eighty-eight million, two hundred twenty-nine thousand, four hundred eighty-one".