172347881 has 2 divisors, whose sum is σ = 172347882. Its totient is φ = 172347880.

The previous prime is 172347869. The next prime is 172347893. The reversal of 172347881 is 188743271.

172347881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (172347869) and next prime (172347893).

It can be written as a sum of positive squares in only one way, i.e., 171610000 + 737881 = 13100^2 + 859^2 .

It is an emirp because it is prime and its reverse (188743271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172347881 - 2¹⁰ = 172346857 is a prime.

It is a super-2 number, since 2×172347881² = 59407584170380322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (172347811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86173940 + 86173941.

It is an arithmetic number, because the mean of its divisors is an integer number (86173941).

Almost surely, 2^172347881 is an apocalyptic number.

It is an amenable number.

172347881 is a deficient number, since it is larger than the sum of its proper divisors (1).

172347881 is an equidigital number, since it uses as much as digits as its factorization.

172347881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75264, while the sum is 41.

The square root of 172347881 is about 13128.1331879289. The cubic root of 172347881 is about 556.5044601717.

The spelling of 172347881 in words is "one hundred seventy-two million, three hundred forty-seven thousand, eight hundred eighty-one".