1988775541 has 4 divisors (see below), whose sum is σ = 1989130572. Its totient is φ = 1988420512.

The previous prime is 1988775527. The next prime is 1988775559. The reversal of 1988775541 is 1455778891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1042967025 + 945808516 = 32295^2 + 30754^2 .

It is a cyclic number.

It is not a de Polignac number, because 1988775541 - 2⁹ = 1988775029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988775511) 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, 168976 + ... + 180361.

It is an arithmetic number, because the mean of its divisors is an integer number (497282643).

Almost surely, 2^1988775541 is an apocalyptic number.

It is an amenable number.

1988775541 is a deficient number, since it is larger than the sum of its proper divisors (355031).

1988775541 is an equidigital number, since it uses as much as digits as its factorization.

1988775541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355030.

The product of its digits is 2822400, while the sum is 55.

The square root of 1988775541 is about 44595.6897132447. The cubic root of 1988775541 is about 1257.5596380803.

The spelling of 1988775541 in words is "one billion, nine hundred eighty-eight million, seven hundred seventy-five thousand, five hundred forty-one".