149781449 has 2 divisors, whose sum is σ = 149781450. Its totient is φ = 149781448.

The previous prime is 149781431. The next prime is 149781479. The reversal of 149781449 is 944187941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135303424 + 14478025 = 11632^2 + 3805^2 .

It is a cyclic number.

It is not a de Polignac number, because 149781449 - 2¹⁶ = 149715913 is a prime.

It is not a weakly prime, because it can be changed into another prime (149781409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74890724 + 74890725.

It is an arithmetic number, because the mean of its divisors is an integer number (74890725).

Almost surely, 2^149781449 is an apocalyptic number.

It is an amenable number.

149781449 is a deficient number, since it is larger than the sum of its proper divisors (1).

149781449 is an equidigital number, since it uses as much as digits as its factorization.

149781449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 47.

The square root of 149781449 is about 12238.5231543679. The cubic root of 149781449 is about 531.0711090596.

The spelling of 149781449 in words is "one hundred forty-nine million, seven hundred eighty-one thousand, four hundred forty-nine".