171431261 has 2 divisors, whose sum is σ = 171431262. Its totient is φ = 171431260.

The previous prime is 171431257. The next prime is 171431269. The reversal of 171431261 is 162134171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167702500 + 3728761 = 12950^2 + 1931^2 .

It is a cyclic number.

It is not a de Polignac number, because 171431261 - 2² = 171431257 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 171431261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171431269) 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, 85715630 + 85715631.

It is an arithmetic number, because the mean of its divisors is an integer number (85715631).

Almost surely, 2^171431261 is an apocalyptic number.

It is an amenable number.

171431261 is a deficient number, since it is larger than the sum of its proper divisors (1).

171431261 is an equidigital number, since it uses as much as digits as its factorization.

171431261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 26.

The square root of 171431261 is about 13093.1761234622. The cubic root of 171431261 is about 555.5161294525.

The spelling of 171431261 in words is "one hundred seventy-one million, four hundred thirty-one thousand, two hundred sixty-one".