165081449 has 4 divisors (see below), whose sum is σ = 177780036. Its totient is φ = 152382864.

The previous prime is 165081401. The next prime is 165081451. The reversal of 165081449 is 944180561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7327849 + 157753600 = 2707^2 + 12560^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165081449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165081149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6349274 + ... + 6349299.

It is an arithmetic number, because the mean of its divisors is an integer number (44445009).

Almost surely, 2^165081449 is an apocalyptic number.

It is an amenable number.

165081449 is a deficient number, since it is larger than the sum of its proper divisors (12698587).

165081449 is a wasteful number, since it uses less digits than its factorization.

165081449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12698586.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 165081449 is about 12848.4025855357. The cubic root of 165081449 is about 548.5708892882.

The spelling of 165081449 in words is "one hundred sixty-five million, eighty-one thousand, four hundred forty-nine".