171091420 has 24 divisors (see below), whose sum is σ = 366073344. Its totient is φ = 67144896.

The previous prime is 171091399. The next prime is 171091423. The reversal of 171091420 is 24190171.

171091420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171091423) 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, 79644 + ... + 81763.

It is an arithmetic number, because the mean of its divisors is an integer number (15253056).

Almost surely, 2^171091420 is an apocalyptic number.

171091420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

171091420 is an abundant number, since it is smaller than the sum of its proper divisors (194981924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

171091420 is a wasteful number, since it uses less digits than its factorization.

171091420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161469 (or 161467 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 171091420 is about 13080.1918946168. The cubic root of 171091420 is about 555.1488062420.

The spelling of 171091420 in words is "one hundred seventy-one million, ninety-one thousand, four hundred twenty".