1988861522 has 8 divisors (see below), whose sum is σ = 2983490172. Its totient is φ = 994364800.

The previous prime is 1988861509. The next prime is 1988861531. The reversal of 1988861522 is 2251688891.

It can be written as a sum of positive squares in 2 ways, for example, as 1983009961 + 5851561 = 44531^2 + 2419^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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, 25322 + ... + 67962.

Almost surely, 2^1988861522 is an apocalyptic number.

1988861522 is a deficient number, since it is larger than the sum of its proper divisors (994628650).

1988861522 is a wasteful number, since it uses less digits than its factorization.

1988861522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65964.

The product of its digits is 552960, while the sum is 50.

The square root of 1988861522 is about 44596.6537085463. The cubic root of 1988861522 is about 1257.5777605673.

The spelling of 1988861522 in words is "one billion, nine hundred eighty-eight million, eight hundred sixty-one thousand, five hundred twenty-two".