172301981 has 2 divisors, whose sum is σ = 172301982. Its totient is φ = 172301980.

The previous prime is 172301971. The next prime is 172302029. The reversal of 172301981 is 189103271.

172301981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134676025 + 37625956 = 11605^2 + 6134^2 .

It is a cyclic number.

It is not a de Polignac number, because 172301981 - 2⁶ = 172301917 is a prime.

It is a super-2 number, since 2×172301981² = 59375945313048722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172301911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86150990 + 86150991.

It is an arithmetic number, because the mean of its divisors is an integer number (86150991).

Almost surely, 2^172301981 is an apocalyptic number.

It is an amenable number.

172301981 is a deficient number, since it is larger than the sum of its proper divisors (1).

172301981 is an equidigital number, since it uses as much as digits as its factorization.

172301981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 172301981 is about 13126.3849174097. The cubic root of 172301981 is about 556.4550526932.

The spelling of 172301981 in words is "one hundred seventy-two million, three hundred one thousand, nine hundred eighty-one".