20931000289 has 2 divisors, whose sum is σ = 20931000290. Its totient is φ = 20931000288.

The previous prime is 20931000281. The next prime is 20931000301. The reversal of 20931000289 is 98200013902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18303925264 + 2627075025 = 135292^2 + 51255^2 .

It is a cyclic number.

It is not a de Polignac number, because 20931000289 - 2³ = 20931000281 is a prime.

It is not a weakly prime, because it can be changed into another prime (20931000281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10465500144 + 10465500145.

It is an arithmetic number, because the mean of its divisors is an integer number (10465500145).

Almost surely, 2^20931000289 is an apocalyptic number.

It is an amenable number.

20931000289 is a deficient number, since it is larger than the sum of its proper divisors (1).

20931000289 is an equidigital number, since it uses as much as digits as its factorization.

20931000289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 34.

The spelling of 20931000289 in words is "twenty billion, nine hundred thirty-one million, two hundred eighty-nine", and thus it is an aban number.