171631423 has 2 divisors, whose sum is σ = 171631424. Its totient is φ = 171631422.

The previous prime is 171631417. The next prime is 171631429. The reversal of 171631423 is 324136171.

It is a balanced prime because it is at equal distance from previous prime (171631417) and next prime (171631429).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171631423 is a prime.

It is a super-2 number, since 2×171631423² = 58914690722009858, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 171631391 and 171631400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171631429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85815711 + 85815712.

It is an arithmetic number, because the mean of its divisors is an integer number (85815712).

Almost surely, 2^171631423 is an apocalyptic number.

171631423 is a deficient number, since it is larger than the sum of its proper divisors (1).

171631423 is an equidigital number, since it uses as much as digits as its factorization.

171631423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 28.

The square root of 171631423 is about 13100.8176462387. The cubic root of 171631423 is about 555.7322510061.

Adding to 171631423 its reverse (324136171), we get a palindrome (495767594).

The spelling of 171631423 in words is "one hundred seventy-one million, six hundred thirty-one thousand, four hundred twenty-three".