72101771 has 4 divisors (see below), whose sum is σ = 82402032. Its totient is φ = 61801512.

The previous prime is 72101761. The next prime is 72101773. The reversal of 72101771 is 17710127.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72101771 - 2²² = 67907467 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72101771.

It is not an unprimeable number, because it can be changed into a prime (72101773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5150120 + ... + 5150133.

It is an arithmetic number, because the mean of its divisors is an integer number (20600508).

Almost surely, 2^72101771 is an apocalyptic number.

72101771 is a deficient number, since it is larger than the sum of its proper divisors (10300261).

72101771 is a wasteful number, since it uses less digits than its factorization.

72101771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10300260.

The product of its (nonzero) digits is 686, while the sum is 26.

The square root of 72101771 is about 8491.2761702821. The cubic root of 72101771 is about 416.2126836360.

Adding to 72101771 its reverse (17710127), we get a palindrome (89811898).

The spelling of 72101771 in words is "seventy-two million, one hundred one thousand, seven hundred seventy-one".