1988117522 has 8 divisors (see below), whose sum is σ = 3062775756. Its totient is φ = 967192272.

The previous prime is 1988117519. The next prime is 1988117561. The reversal of 1988117522 is 2257118891.

It can be written as a sum of positive squares in 2 ways, for example, as 1980339001 + 7778521 = 44501^2 + 2789^2 .

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

It is a super-2 number, since 2×1988117522² = 7905222562566840968, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13433153 + ... + 13433300.

Almost surely, 2^1988117522 is an apocalyptic number.

1988117522 is a deficient number, since it is larger than the sum of its proper divisors (1074658234).

1988117522 is a wasteful number, since it uses less digits than its factorization.

1988117522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26866492.

The product of its digits is 80640, while the sum is 44.

The square root of 1988117522 is about 44588.3114952787. The cubic root of 1988117522 is about 1257.4209280383.

The spelling of 1988117522 in words is "one billion, nine hundred eighty-eight million, one hundred seventeen thousand, five hundred twenty-two".