171430631 has 2 divisors, whose sum is σ = 171430632. Its totient is φ = 171430630.

The previous prime is 171430621. The next prime is 171430639. The reversal of 171430631 is 136034171.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171430631 is a prime.

It is a super-2 number, since 2×171430631² = 58776922490116322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 171430631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171430639) 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, 85715315 + 85715316.

It is an arithmetic number, because the mean of its divisors is an integer number (85715316).

Almost surely, 2^171430631 is an apocalyptic number.

171430631 is a deficient number, since it is larger than the sum of its proper divisors (1).

171430631 is an equidigital number, since it uses as much as digits as its factorization.

171430631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 171430631 is about 13093.1520651064. The cubic root of 171430631 is about 555.5154489551.

The spelling of 171430631 in words is "one hundred seventy-one million, four hundred thirty thousand, six hundred thirty-one".