171028391 has 8 divisors (see below), whose sum is σ = 178606080. Its totient is φ = 163462552.

The previous prime is 171028379. The next prime is 171028397. The reversal of 171028391 is 193820171.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 171028391 - 2¹⁴ = 171012007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171028397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39890 + ... + 43968.

It is an arithmetic number, because the mean of its divisors is an integer number (22325760).

Almost surely, 2^171028391 is an apocalyptic number.

171028391 is a deficient number, since it is larger than the sum of its proper divisors (7577689).

171028391 is a wasteful number, since it uses less digits than its factorization.

171028391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5925.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 171028391 is about 13077.7823425839. The cubic root of 171028391 is about 555.0806267628.

The spelling of 171028391 in words is "one hundred seventy-one million, twenty-eight thousand, three hundred ninety-one".