172880891 has 2 divisors, whose sum is σ = 172880892. Its totient is φ = 172880890.

The previous prime is 172880849. The next prime is 172880923. The reversal of 172880891 is 198088271.

It is a strong prime.

It is an emirp because it is prime and its reverse (198088271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172880891 - 2¹⁰ = 172879867 is a prime.

It is not a weakly prime, because it can be changed into another prime (172880801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86440445 + 86440446.

It is an arithmetic number, because the mean of its divisors is an integer number (86440446).

Almost surely, 2^172880891 is an apocalyptic number.

172880891 is a deficient number, since it is larger than the sum of its proper divisors (1).

172880891 is an equidigital number, since it uses as much as digits as its factorization.

172880891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 44.

The square root of 172880891 is about 13148.4178135622. The cubic root of 172880891 is about 557.0775591517.

The spelling of 172880891 in words is "one hundred seventy-two million, eight hundred eighty thousand, eight hundred ninety-one".