72171542 has 4 divisors (see below), whose sum is σ = 108257316. Its totient is φ = 36085770.

The previous prime is 72171527. The next prime is 72171553. The reversal of 72171542 is 24517127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24517127 = 47 ⋅521641.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18042884 + ... + 18042887.

It is an arithmetic number, because the mean of its divisors is an integer number (27064329).

Almost surely, 2^72171542 is an apocalyptic number.

72171542 is a deficient number, since it is larger than the sum of its proper divisors (36085774).

72171542 is a wasteful number, since it uses less digits than its factorization.

72171542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36085773.

The product of its digits is 3920, while the sum is 29.

The square root of 72171542 is about 8495.3835699161. The cubic root of 72171542 is about 416.3468930682.

Adding to 72171542 its reverse (24517127), we get a palindrome (96688669).

The spelling of 72171542 in words is "seventy-two million, one hundred seventy-one thousand, five hundred forty-two".