149457409 has 2 divisors, whose sum is σ = 149457410. Its totient is φ = 149457408.

The previous prime is 149457397. The next prime is 149457431. The reversal of 149457409 is 904754941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131606784 + 17850625 = 11472^2 + 4225^2 .

It is an emirp because it is prime and its reverse (904754941) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 149457409 - 2⁹ = 149456897 is a prime.

It is not a weakly prime, because it can be changed into another prime (149457449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74728704 + 74728705.

It is an arithmetic number, because the mean of its divisors is an integer number (74728705).

Almost surely, 2^149457409 is an apocalyptic number.

It is an amenable number.

149457409 is a deficient number, since it is larger than the sum of its proper divisors (1).

149457409 is an equidigital number, since it uses as much as digits as its factorization.

149457409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 149457409 is about 12225.2774610640. The cubic root of 149457409 is about 530.6878561437.

The spelling of 149457409 in words is "one hundred forty-nine million, four hundred fifty-seven thousand, four hundred nine".