172000987 has 2 divisors, whose sum is σ = 172000988. Its totient is φ = 172000986.

The previous prime is 172000973. The next prime is 172001009. The reversal of 172000987 is 789000271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172000987 - 2¹⁹ = 171476699 is a prime.

It is not a weakly prime, because it can be changed into another prime (172000937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86000493 + 86000494.

It is an arithmetic number, because the mean of its divisors is an integer number (86000494).

Almost surely, 2^172000987 is an apocalyptic number.

172000987 is a deficient number, since it is larger than the sum of its proper divisors (1).

172000987 is an equidigital number, since it uses as much as digits as its factorization.

172000987 is an evil number, because the sum of its binary digits is even.

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

The square root of 172000987 is about 13114.9146775722. The cubic root of 172000987 is about 556.1308404100.

The spelling of 172000987 in words is "one hundred seventy-two million, nine hundred eighty-seven", and thus it is an aban number.