31000889 has 2 divisors, whose sum is σ = 31000890. Its totient is φ = 31000888.

The previous prime is 31000873. The next prime is 31000891. The reversal of 31000889 is 98800013.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28440889 + 2560000 = 5333^2 + 1600^2 .

It is a cyclic number.

It is not a de Polignac number, because 31000889 - 2⁴ = 31000873 is a prime.

It is a super-2 number, since 2×31000889² = 1922110237580642, which contains 22 as substring.

Together with 31000891, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31000829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15500444 + 15500445.

It is an arithmetic number, because the mean of its divisors is an integer number (15500445).

Almost surely, 2^31000889 is an apocalyptic number.

It is an amenable number.

31000889 is a deficient number, since it is larger than the sum of its proper divisors (1).

31000889 is an equidigital number, since it uses as much as digits as its factorization.

31000889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 31000889 is about 5567.8441968144. The cubic root of 31000889 is about 314.1410681001.

The spelling of 31000889 in words is "thirty-one million, eight hundred eighty-nine", and thus it is an aban number.