172142881 has 2 divisors, whose sum is σ = 172142882. Its totient is φ = 172142880.

The previous prime is 172142863. The next prime is 172142891. The reversal of 172142881 is 188241271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105165025 + 66977856 = 10255^2 + 8184^2 .

It is a cyclic number.

It is not a de Polignac number, because 172142881 - 2⁵ = 172142849 is a prime.

It is a super-2 number, since 2×172142881² = 59266342957960322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (172142891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86071440 + 86071441.

It is an arithmetic number, because the mean of its divisors is an integer number (86071441).

Almost surely, 2^172142881 is an apocalyptic number.

It is an amenable number.

172142881 is a deficient number, since it is larger than the sum of its proper divisors (1).

172142881 is an equidigital number, since it uses as much as digits as its factorization.

172142881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7168, while the sum is 34.

The square root of 172142881 is about 13120.3232048605. The cubic root of 172142881 is about 556.2837270128.

The spelling of 172142881 in words is "one hundred seventy-two million, one hundred forty-two thousand, eight hundred eighty-one".