1331216639 has 8 divisors (see below), whose sum is σ = 1344498048. Its totient is φ = 1317951000.

The previous prime is 1331216633. The next prime is 1331216647. The reversal of 1331216639 is 9366121331.

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-1331216639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1331216599 and 1331216608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331216633) 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, 238094 + ... + 243620.

It is an arithmetic number, because the mean of its divisors is an integer number (168062256).

Almost surely, 2^1331216639 is an apocalyptic number.

1331216639 is a deficient number, since it is larger than the sum of its proper divisors (13281409).

1331216639 is a wasteful number, since it uses less digits than its factorization.

1331216639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7885.

The product of its digits is 17496, while the sum is 35.

The square root of 1331216639 is about 36485.8416238409. The cubic root of 1331216639 is about 1100.0596769277.

The spelling of 1331216639 in words is "one billion, three hundred thirty-one million, two hundred sixteen thousand, six hundred thirty-nine".