197145 has 24 divisors (see below), whose sum is σ = 369096. Its totient is φ = 96768.

The previous prime is 197137. The next prime is 197147. The reversal of 197145 is 541791.

It can be written as a sum of positive squares in 4 ways, for example, as 9 + 197136 = 3^2 + 444^2 .

It is not a de Polignac number, because 197145 - 2³ = 197137 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (197147) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 417 + ... + 753.

It is an arithmetic number, because the mean of its divisors is an integer number (15379).

2¹⁹⁷¹⁴⁵ is an apocalyptic number.

197145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

197145 is a deficient number, since it is larger than the sum of its proper divisors (171951).

197145 is a wasteful number, since it uses less digits than its factorization.

197145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361 (or 358 counting only the distinct ones).

The product of its digits is 1260, while the sum is 27.

The square root of 197145 is about 444.0101350195. The cubic root of 197145 is about 58.2007510443.

It can be divided in two parts, 1971 and 45, that added together give a triangular number (2016 = T₆₃).

The spelling of 197145 in words is "one hundred ninety-seven thousand, one hundred forty-five".