1988861523 has 8 divisors (see below), whose sum is σ = 2892889536. Its totient is φ = 1205370600.

The previous prime is 1988861509. The next prime is 1988861531. The reversal of 1988861523 is 3251688891.

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

It is not a de Polignac number, because 1988861523 - 2⁵ = 1988861491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1988861533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30134233 + ... + 30134298.

It is an arithmetic number, because the mean of its divisors is an integer number (361611192).

Almost surely, 2^1988861523 is an apocalyptic number.

1988861523 is a deficient number, since it is larger than the sum of its proper divisors (904028013).

1988861523 is a wasteful number, since it uses less digits than its factorization.

1988861523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60268545.

The product of its digits is 829440, while the sum is 51.

The square root of 1988861523 is about 44596.6537197579. The cubic root of 1988861523 is about 1257.5777607781.

The spelling of 1988861523 in words is "one billion, nine hundred eighty-eight million, eight hundred sixty-one thousand, five hundred twenty-three".