308144989 has 2 divisors, whose sum is σ = 308144990. Its totient is φ = 308144988.

The previous prime is 308144987. The next prime is 308145031. The reversal of 308144989 is 989441803.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 299636100 + 8508889 = 17310^2 + 2917^2 .

It is a cyclic number.

It is not a de Polignac number, because 308144989 - 2¹ = 308144987 is a prime.

Together with 308144987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (308144987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154072494 + 154072495.

It is an arithmetic number, because the mean of its divisors is an integer number (154072495).

Almost surely, 2^308144989 is an apocalyptic number.

It is an amenable number.

308144989 is a deficient number, since it is larger than the sum of its proper divisors (1).

308144989 is an equidigital number, since it uses as much as digits as its factorization.

308144989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 308144989 is about 17554.0590462719. The cubic root of 308144989 is about 675.4372943269.

The spelling of 308144989 in words is "three hundred eight million, one hundred forty-four thousand, nine hundred eighty-nine".