1630688189 has 8 divisors (see below), whose sum is σ = 1757629272. Its totient is φ = 1503961920.

The previous prime is 1630688179. The next prime is 1630688207. The reversal of 1630688189 is 9818860361.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 106956964 + 1523731225 = 10342^2 + 39035^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1630688189 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 (1630688119) 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, 37754 + ... + 68459.

It is an arithmetic number, because the mean of its divisors is an integer number (219703659).

Almost surely, 2^1630688189 is an apocalyptic number.

It is an amenable number.

1630688189 is a deficient number, since it is larger than the sum of its proper divisors (126941083).

1630688189 is a wasteful number, since it uses less digits than its factorization.

1630688189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107407.

The product of its (nonzero) digits is 497664, while the sum is 50.

The square root of 1630688189 is about 40381.7804089914. The cubic root of 1630688189 is about 1177.0375244263.

The spelling of 1630688189 in words is "one billion, six hundred thirty million, six hundred eighty-eight thousand, one hundred eighty-nine".