3138631661 has 8 divisors (see below), whose sum is σ = 3457863648. Its totient is φ = 2825050000.

The previous prime is 3138631651. The next prime is 3138631663. The reversal of 3138631661 is 1661368313.

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 3138631661 - 2²² = 3134437357 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 (3138631663) 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, 1411415 + ... + 1413636.

It is an arithmetic number, because the mean of its divisors is an integer number (432232956).

Almost surely, 2^3138631661 is an apocalyptic number.

It is an amenable number.

3138631661 is a deficient number, since it is larger than the sum of its proper divisors (319231987).

3138631661 is a wasteful number, since it uses less digits than its factorization.

3138631661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2825163.

The product of its digits is 46656, while the sum is 38.

The square root of 3138631661 is about 56023.4920457481. The cubic root of 3138631661 is about 1464.1316105230.

Adding to 3138631661 its reverse (1661368313), we get a palindrome (4799999974).

The spelling of 3138631661 in words is "three billion, one hundred thirty-eight million, six hundred thirty-one thousand, six hundred sixty-one".