171532987 has 2 divisors, whose sum is σ = 171532988. Its totient is φ = 171532986.

The previous prime is 171532943. The next prime is 171532997. The reversal of 171532987 is 789235171.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 171532987 - 2⁷ = 171532859 is a prime.

It is not a weakly prime, because it can be changed into another prime (171532927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85766493 + 85766494.

It is an arithmetic number, because the mean of its divisors is an integer number (85766494).

Almost surely, 2^171532987 is an apocalyptic number.

171532987 is a deficient number, since it is larger than the sum of its proper divisors (1).

171532987 is an equidigital number, since it uses as much as digits as its factorization.

171532987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105840, while the sum is 43.

The square root of 171532987 is about 13097.0602426651. The cubic root of 171532987 is about 555.6259874008.

The spelling of 171532987 in words is "one hundred seventy-one million, five hundred thirty-two thousand, nine hundred eighty-seven".