308431093 has 2 divisors, whose sum is σ = 308431094. Its totient is φ = 308431092.

The previous prime is 308431091. The next prime is 308431099. The reversal of 308431093 is 390134803.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 286218724 + 22212369 = 16918^2 + 4713^2 .

It is a cyclic number.

It is not a de Polignac number, because 308431093 - 2¹ = 308431091 is a prime.

Together with 308431091, 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 (308431091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154215546 + 154215547.

It is an arithmetic number, because the mean of its divisors is an integer number (154215547).

Almost surely, 2^308431093 is an apocalyptic number.

It is an amenable number.

308431093 is a deficient number, since it is larger than the sum of its proper divisors (1).

308431093 is an equidigital number, since it uses as much as digits as its factorization.

308431093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 308431093 is about 17562.2063818872. The cubic root of 308431093 is about 675.6462712066.

Adding to 308431093 its reverse (390134803), we get a palindrome (698565896).

The spelling of 308431093 in words is "three hundred eight million, four hundred thirty-one thousand, ninety-three".