172235641 has 2 divisors, whose sum is σ = 172235642. Its totient is φ = 172235640.

The previous prime is 172235639. The next prime is 172235647. The reversal of 172235641 is 146532271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154629225 + 17606416 = 12435^2 + 4196^2 .

It is a cyclic number.

It is not a de Polignac number, because 172235641 - 2¹ = 172235639 is a prime.

Together with 172235639, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (172235647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86117820 + 86117821.

It is an arithmetic number, because the mean of its divisors is an integer number (86117821).

Almost surely, 2^172235641 is an apocalyptic number.

It is an amenable number.

172235641 is a deficient number, since it is larger than the sum of its proper divisors (1).

172235641 is an equidigital number, since it uses as much as digits as its factorization.

172235641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 31.

The square root of 172235641 is about 13123.8577026726. The cubic root of 172235641 is about 556.3836277707.

The spelling of 172235641 in words is "one hundred seventy-two million, two hundred thirty-five thousand, six hundred forty-one".