197855145 has 12 divisors (see below), whose sum is σ = 342948996. Its totient is φ = 105522720.

The previous prime is 197855137. The next prime is 197855159. The reversal of 197855145 is 541558791.

197855145 is a `hidden beast` number, since 1 + 97 + 8 + 551 + 4 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 67963536 + 129891609 = 8244^2 + 11397^2 .

It is not a de Polignac number, because 197855145 - 2³ = 197855137 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 4396781 = 197855145 / (1 + 9 + 7 + 8 + 5 + 5 + 1 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 197855145.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2198346 + ... + 2198435.

It is an arithmetic number, because the mean of its divisors is an integer number (28579083).

Almost surely, 2^197855145 is an apocalyptic number.

197855145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

197855145 is a deficient number, since it is larger than the sum of its proper divisors (145093851).

197855145 is a wasteful number, since it uses less digits than its factorization.

197855145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4396792 (or 4396789 counting only the distinct ones).

The product of its digits is 252000, while the sum is 45.

The square root of 197855145 is about 14066.0991394203. The cubic root of 197855145 is about 582.7054982976.

The spelling of 197855145 in words is "one hundred ninety-seven million, eight hundred fifty-five thousand, one hundred forty-five".