72126171 has 12 divisors (see below), whose sum is σ = 112196448. Its totient is φ = 44385264.

The previous prime is 72126169. The next prime is 72126191. The reversal of 72126171 is 17162127.

It is not a de Polignac number, because 72126171 - 2¹ = 72126169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72126101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 308115 + ... + 308348.

It is an arithmetic number, because the mean of its divisors is an integer number (9349704).

Almost surely, 2^72126171 is an apocalyptic number.

72126171 is a deficient number, since it is larger than the sum of its proper divisors (40070277).

72126171 is a wasteful number, since it uses less digits than its factorization.

72126171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616482 (or 616479 counting only the distinct ones).

The product of its digits is 1176, while the sum is 27.

The square root of 72126171 is about 8492.7128174689. The cubic root of 72126171 is about 416.2596285953.

Adding to 72126171 its reverse (17162127), we get a palindrome (89288298).

The spelling of 72126171 in words is "seventy-two million, one hundred twenty-six thousand, one hundred seventy-one".