172235381324861 has 2 divisors, whose sum is σ = 172235381324862. Its totient is φ = 172235381324860.

The previous prime is 172235381324821. The next prime is 172235381324879. The reversal of 172235381324861 is 168423183532271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96448014432025 + 75787366892836 = 9820795^2 + 8705594^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172235381324861 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 172235381324797 and 172235381324806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172235381324801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86117690662430 + 86117690662431.

It is an arithmetic number, because the mean of its divisors is an integer number (86117690662431).

Almost surely, 2^{172235381324861} is an apocalyptic number.

It is an amenable number.

172235381324861 is a deficient number, since it is larger than the sum of its proper divisors (1).

172235381324861 is an equidigital number, since it uses as much as digits as its factorization.

172235381324861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11612160, while the sum is 56.

The spelling of 172235381324861 in words is "one hundred seventy-two trillion, two hundred thirty-five billion, three hundred eighty-one million, three hundred twenty-four thousand, eight hundred sixty-one".