148591309 has 2 divisors, whose sum is σ = 148591310. Its totient is φ = 148591308.

The previous prime is 148591291. The next prime is 148591349. The reversal of 148591309 is 903195841.

It is an a-pointer prime, because the next prime (148591349) can be obtained adding 148591309 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127916100 + 20675209 = 11310^2 + 4547^2 .

It is a cyclic number.

It is not a de Polignac number, because 148591309 - 2⁹ = 148590797 is a prime.

It is a super-2 number, since 2×148591309² = 44158754220666962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (148591349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74295654 + 74295655.

It is an arithmetic number, because the mean of its divisors is an integer number (74295655).

Almost surely, 2^148591309 is an apocalyptic number.

It is an amenable number.

148591309 is a deficient number, since it is larger than the sum of its proper divisors (1).

148591309 is an equidigital number, since it uses as much as digits as its factorization.

148591309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 148591309 is about 12189.8034848803. The cubic root of 148591309 is about 529.6607642820.

The spelling of 148591309 in words is "one hundred forty-eight million, five hundred ninety-one thousand, three hundred nine".