165401197 has 4 divisors (see below), whose sum is σ = 178124380. Its totient is φ = 152678016.

The previous prime is 165401189. The next prime is 165401207. The reversal of 165401197 is 791104561.

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 56115081 + 109286116 = 7491^2 + 10454^2 .

It is a cyclic number.

It is not a de Polignac number, because 165401197 - 2³ = 165401189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165401147) 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, 6361572 + ... + 6361597.

It is an arithmetic number, because the mean of its divisors is an integer number (44531095).

Almost surely, 2^165401197 is an apocalyptic number.

It is an amenable number.

165401197 is a deficient number, since it is larger than the sum of its proper divisors (12723183).

165401197 is a wasteful number, since it uses less digits than its factorization.

165401197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12723182.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 165401197 is about 12860.8396693218. The cubic root of 165401197 is about 548.9248384446.

The spelling of 165401197 in words is "one hundred sixty-five million, four hundred one thousand, one hundred ninety-seven".