1988322613 has 8 divisors (see below), whose sum is σ = 2080592568. Its totient is φ = 1898080704.

The previous prime is 1988322599. The next prime is 1988322683. The reversal of 1988322613 is 3162238891.

It can be written as a sum of positive squares in 4 ways, for example, as 663217009 + 1325105604 = 25753^2 + 36402^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1988322613 - 2¹³ = 1988314421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1988322613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988322683) 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, 505006 + ... + 508927.

It is an arithmetic number, because the mean of its divisors is an integer number (260074071).

Almost surely, 2^1988322613 is an apocalyptic number.

It is an amenable number.

1988322613 is a deficient number, since it is larger than the sum of its proper divisors (92269955).

1988322613 is a wasteful number, since it uses less digits than its factorization.

1988322613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014023.

The product of its digits is 124416, while the sum is 43.

The square root of 1988322613 is about 44590.6112651531. The cubic root of 1988322613 is about 1257.4641643906.

The spelling of 1988322613 in words is "one billion, nine hundred eighty-eight million, three hundred twenty-two thousand, six hundred thirteen".