149313809 has 2 divisors, whose sum is σ = 149313810. Its totient is φ = 149313808.

The previous prime is 149313757. The next prime is 149313817. The reversal of 149313809 is 908313941.

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., 149206225 + 107584 = 12215^2 + 328^2 .

It is a cyclic number.

It is not a de Polignac number, because 149313809 - 2²⁰ = 148265233 is a prime.

It is a super-2 number, since 2×149313809² = 44589227116176962, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (149313859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74656904 + 74656905.

It is an arithmetic number, because the mean of its divisors is an integer number (74656905).

Almost surely, 2^149313809 is an apocalyptic number.

It is an amenable number.

149313809 is a deficient number, since it is larger than the sum of its proper divisors (1).

149313809 is an equidigital number, since it uses as much as digits as its factorization.

149313809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 149313809 is about 12219.4029723223. The cubic root of 149313809 is about 530.5178384858.

The spelling of 149313809 in words is "one hundred forty-nine million, three hundred thirteen thousand, eight hundred nine".