31240889 has 2 divisors, whose sum is σ = 31240890. Its totient is φ = 31240888.

The previous prime is 31240879. The next prime is 31240931. The reversal of 31240889 is 98804213.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17305600 + 13935289 = 4160^2 + 3733^2 .

It is an emirp because it is prime and its reverse (98804213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31240889 - 2²⁰ = 30192313 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (31240819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15620444 + 15620445.

It is an arithmetic number, because the mean of its divisors is an integer number (15620445).

Almost surely, 2^31240889 is an apocalyptic number.

It is an amenable number.

31240889 is a deficient number, since it is larger than the sum of its proper divisors (1).

31240889 is an equidigital number, since it uses as much as digits as its factorization.

31240889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 31240889 is about 5589.3549717297. The cubic root of 31240889 is about 314.9496484565.

The spelling of 31240889 in words is "thirty-one million, two hundred forty thousand, eight hundred eighty-nine".