165343961 has 4 divisors (see below), whose sum is σ = 165737124. Its totient is φ = 164950800.

The previous prime is 165343949. The next prime is 165343963. The reversal of 165343961 is 169343561.

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 76230361 + 89113600 = 8731^2 + 9440^2 .

It is a cyclic number.

It is not a de Polignac number, because 165343961 - 2²² = 161149657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165343963) 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 in 3 ways as a sum of consecutive naturals, for example, 195950 + ... + 196791.

It is an arithmetic number, because the mean of its divisors is an integer number (41434281).

Almost surely, 2^165343961 is an apocalyptic number.

It is an amenable number.

165343961 is a deficient number, since it is larger than the sum of its proper divisors (393163).

165343961 is an equidigital number, since it uses as much as digits as its factorization.

165343961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393162.

The product of its digits is 58320, while the sum is 38.

The square root of 165343961 is about 12858.6142721523. The cubic root of 165343961 is about 548.8615138590.

The spelling of 165343961 in words is "one hundred sixty-five million, three hundred forty-three thousand, nine hundred sixty-one".