170551 has 2 divisors, whose sum is σ = 170552. Its totient is φ = 170550.

The previous prime is 170539. The next prime is 170557. The reversal of 170551 is 155071.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 170551 - 2¹³ = 162359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (170557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85275 + 85276.

It is an arithmetic number, because the mean of its divisors is an integer number (85276).

2¹⁷⁰⁵⁵¹ is an apocalyptic number.

170551 is a deficient number, since it is larger than the sum of its proper divisors (1).

170551 is an equidigital number, since it uses as much as digits as its factorization.

170551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 175, while the sum is 19.

The square root of 170551 is about 412.9782076575. The cubic root of 170551 is about 55.4563680555.

The spelling of 170551 in words is "one hundred seventy thousand, five hundred fifty-one".