172987 has 2 divisors, whose sum is σ = 172988. Its totient is φ = 172986.

The previous prime is 172981. The next prime is 172993. The reversal of 172987 is 789271.

It is a balanced prime because it is at equal distance from previous prime (172981) and next prime (172993).

It is a cyclic number.

It is not a de Polignac number, because 172987 - 2⁷ = 172859 is a prime.

It is not a weakly prime, because it can be changed into another prime (172981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86493 + 86494.

It is an arithmetic number, because the mean of its divisors is an integer number (86494).

2¹⁷²⁹⁸⁷ is an apocalyptic number.

172987 is a deficient number, since it is larger than the sum of its proper divisors (1).

172987 is an equidigital number, since it uses as much as digits as its factorization.

172987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 34.

The square root of 172987 is about 415.9170590394. The cubic root of 172987 is about 55.7191508228.

The spelling of 172987 in words is "one hundred seventy-two thousand, nine hundred eighty-seven".