72161017 has 4 divisors (see below), whose sum is σ = 72178036. Its totient is φ = 72144000.

The previous prime is 72161003. The next prime is 72161029. The reversal of 72161017 is 71016127.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 26409321 + 45751696 = 5139^2 + 6764^2 .

It is a cyclic number.

It is not a de Polignac number, because 72161017 - 2¹¹ = 72158969 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72160982 and 72161000.

It is not an unprimeable number, because it can be changed into a prime (72161057) 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, 3517 + ... + 12517.

It is an arithmetic number, because the mean of its divisors is an integer number (18044509).

Almost surely, 2^72161017 is an apocalyptic number.

It is an amenable number.

72161017 is a deficient number, since it is larger than the sum of its proper divisors (17019).

72161017 is an equidigital number, since it uses as much as digits as its factorization.

72161017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17018.

The product of its (nonzero) digits is 588, while the sum is 25.

The square root of 72161017 is about 8494.7640932518. The cubic root of 72161017 is about 416.3266530310.

The spelling of 72161017 in words is "seventy-two million, one hundred sixty-one thousand, seventeen".