31889046187289 has 4 divisors (see below), whose sum is σ = 31889061266100. Its totient is φ = 31889031108480.

The previous prime is 31889046187283. The next prime is 31889046187331. The reversal of 31889046187289 is 98278164098813.

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 25833839290000 + 6055206897289 = 5082700^2 + 2460733^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31889046187289 is a prime.

It is a super-2 number, since 2×31889046187289² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31889046187283) 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, 3723332 + ... + 8811429.

It is an arithmetic number, because the mean of its divisors is an integer number (7972265316525).

Almost surely, 2^{31889046187289} is an apocalyptic number.

It is an amenable number.

31889046187289 is a deficient number, since it is larger than the sum of its proper divisors (15078811).

31889046187289 is a wasteful number, since it uses less digits than its factorization.

31889046187289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15078810.

The product of its (nonzero) digits is 334430208, while the sum is 74.

The spelling of 31889046187289 in words is "thirty-one trillion, eight hundred eighty-nine billion, forty-six million, one hundred eighty-seven thousand, two hundred eighty-nine".