1331616889 has 4 divisors (see below), whose sum is σ = 1333632100. Its totient is φ = 1329601680.

The previous prime is 1331616833. The next prime is 1331616907. The reversal of 1331616889 is 9886161331.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 929213289 + 402403600 = 30483^2 + 20060^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331616889 - 2¹⁷ = 1331485817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1331616589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1006614 + ... + 1007935.

It is an arithmetic number, because the mean of its divisors is an integer number (333408025).

Almost surely, 2^1331616889 is an apocalyptic number.

It is an amenable number.

1331616889 is a deficient number, since it is larger than the sum of its proper divisors (2015211).

1331616889 is an equidigital number, since it uses as much as digits as its factorization.

1331616889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2015210.

The product of its digits is 186624, while the sum is 46.

The square root of 1331616889 is about 36491.3262159653. The cubic root of 1331616889 is about 1100.1699156253.

The spelling of 1331616889 in words is "one billion, three hundred thirty-one million, six hundred sixteen thousand, eight hundred eighty-nine".