72161039 has 4 divisors (see below), whose sum is σ = 76405824. Its totient is φ = 67916256.

The previous prime is 72161029. The next prime is 72161041. The reversal of 72161039 is 93016127.

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

It is a cyclic number.

It is not a de Polignac number, because 72161039 - 2¹⁶ = 72095503 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 (72161029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2122367 + ... + 2122400.

It is an arithmetic number, because the mean of its divisors is an integer number (19101456).

Almost surely, 2^72161039 is an apocalyptic number.

72161039 is a deficient number, since it is larger than the sum of its proper divisors (4244785).

72161039 is a wasteful number, since it uses less digits than its factorization.

72161039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4244784.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 72161039 is about 8494.7653881670. The cubic root of 72161039 is about 416.3266953400.

The spelling of 72161039 in words is "seventy-two million, one hundred sixty-one thousand, thirty-nine".