172681133 has 2 divisors, whose sum is σ = 172681134. Its totient is φ = 172681132.

The previous prime is 172681111. The next prime is 172681147. The reversal of 172681133 is 331186271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114875524 + 57805609 = 10718^2 + 7603^2 .

It is a cyclic number.

It is not a de Polignac number, because 172681133 - 2¹⁸ = 172418989 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 172681133.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172681433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86340566 + 86340567.

It is an arithmetic number, because the mean of its divisors is an integer number (86340567).

Almost surely, 2^172681133 is an apocalyptic number.

It is an amenable number.

172681133 is a deficient number, since it is larger than the sum of its proper divisors (1).

172681133 is an equidigital number, since it uses as much as digits as its factorization.

172681133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 32.

The square root of 172681133 is about 13140.8193427959. The cubic root of 172681133 is about 556.8629150571.

The spelling of 172681133 in words is "one hundred seventy-two million, six hundred eighty-one thousand, one hundred thirty-three".