72161571 has 8 divisors (see below), whose sum is σ = 97168464. Its totient is φ = 47631200.

The previous prime is 72161561. The next prime is 72161629. The reversal of 72161571 is 17516127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72161571 - 2¹⁴ = 72145187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72161561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118776 + ... + 119381.

It is an arithmetic number, because the mean of its divisors is an integer number (12146058).

Almost surely, 2^72161571 is an apocalyptic number.

72161571 is a deficient number, since it is larger than the sum of its proper divisors (25006893).

72161571 is a wasteful number, since it uses less digits than its factorization.

72161571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238261.

The product of its digits is 2940, while the sum is 30.

The square root of 72161571 is about 8494.7967015109. The cubic root of 72161571 is about 416.3277184464.

Adding to 72161571 its reverse (17516127), we get a palindrome (89677698).

The spelling of 72161571 in words is "seventy-two million, one hundred sixty-one thousand, five hundred seventy-one".