172948081 has 2 divisors, whose sum is σ = 172948082. Its totient is φ = 172948080.

The previous prime is 172948079. The next prime is 172948091. The reversal of 172948081 is 180849271.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133056225 + 39891856 = 11535^2 + 6316^2 .

It is a cyclic number.

It is not a de Polignac number, because 172948081 - 2¹ = 172948079 is a prime.

It is a super-2 number, since 2×172948081² = 59822077443165122, which contains 22 as substring.

Together with 172948079, it forms a pair of twin primes.

It is equal to p_9658660 and since 172948081 and 9658660 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (172948031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86474040 + 86474041.

It is an arithmetic number, because the mean of its divisors is an integer number (86474041).

Almost surely, 2^172948081 is an apocalyptic number.

It is an amenable number.

172948081 is a deficient number, since it is larger than the sum of its proper divisors (1).

172948081 is an equidigital number, since it uses as much as digits as its factorization.

172948081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 172948081 is about 13150.9726256274. The cubic root of 172948081 is about 557.1497190320.

The spelling of 172948081 in words is "one hundred seventy-two million, nine hundred forty-eight thousand, eighty-one".