72031165 has 4 divisors (see below), whose sum is σ = 86437404. Its totient is φ = 57624928.

The previous prime is 72031163. The next prime is 72031181. The reversal of 72031165 is 56113027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56113027 = 2381 ⋅23567.

It can be written as a sum of positive squares in 2 ways, for example, as 8637721 + 63393444 = 2939^2 + 7962^2 .

It is a cyclic number.

It is not a de Polignac number, because 72031165 - 2¹ = 72031163 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 (72031163) 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, 7203112 + ... + 7203121.

It is an arithmetic number, because the mean of its divisors is an integer number (21609351).

Almost surely, 2^72031165 is an apocalyptic number.

It is an amenable number.

72031165 is a deficient number, since it is larger than the sum of its proper divisors (14406239).

72031165 is a wasteful number, since it uses less digits than its factorization.

72031165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14406238.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 72031165 is about 8487.1175907961. The cubic root of 72031165 is about 416.0767798524.

The spelling of 72031165 in words is "seventy-two million, thirty-one thousand, one hundred sixty-five".