172131413 has 2 divisors, whose sum is σ = 172131414. Its totient is φ = 172131412.

The previous prime is 172131403. The next prime is 172131419. The reversal of 172131413 is 314131271.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136585969 + 35545444 = 11687^2 + 5962^2 .

It is a cyclic number.

It is not a de Polignac number, because 172131413 - 2⁴ = 172131397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172131419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86065706 + 86065707.

It is an arithmetic number, because the mean of its divisors is an integer number (86065707).

Almost surely, 2^172131413 is an apocalyptic number.

It is an amenable number.

172131413 is a deficient number, since it is larger than the sum of its proper divisors (1).

172131413 is an equidigital number, since it uses as much as digits as its factorization.

172131413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504, while the sum is 23.

The square root of 172131413 is about 13119.8861656647. The cubic root of 172131413 is about 556.2713737021.

Adding to 172131413 its reverse (314131271), we get a palindrome (486262684).

The spelling of 172131413 in words is "one hundred seventy-two million, one hundred thirty-one thousand, four hundred thirteen".