72713161 has 4 divisors (see below), whose sum is σ = 73244052. Its totient is φ = 72182272.

The previous prime is 72713153. The next prime is 72713219. The reversal of 72713161 is 16131727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16131727 = 1823 ⋅8849.

It can be written as a sum of positive squares in 2 ways, for example, as 46498761 + 26214400 = 6819^2 + 5120^2 .

It is a cyclic number.

It is not a de Polignac number, because 72713161 - 2³ = 72713153 is a prime.

It is a super-2 number, since 2×72713161² = 10574407565223842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72713141) 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, 265240 + ... + 265513.

It is an arithmetic number, because the mean of its divisors is an integer number (18311013).

Almost surely, 2^72713161 is an apocalyptic number.

It is an amenable number.

72713161 is a deficient number, since it is larger than the sum of its proper divisors (530891).

72713161 is a wasteful number, since it uses less digits than its factorization.

72713161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530890.

The product of its digits is 1764, while the sum is 28.

The square root of 72713161 is about 8527.2012407354. The cubic root of 72713161 is about 417.3858049999.

Adding to 72713161 its reverse (16131727), we get a palindrome (88844888).

The spelling of 72713161 in words is "seventy-two million, seven hundred thirteen thousand, one hundred sixty-one".