197181855 has 96 divisors (see below), whose sum is σ = 387459072. Its totient is φ = 92102400.

The previous prime is 197181823. The next prime is 197181857. The reversal of 197181855 is 558181791.

197181855 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 197181855 - 2⁵ = 197181823 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 197181855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197181857) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1505140 + ... + 1505270.

It is an arithmetic number, because the mean of its divisors is an integer number (4036032).

Almost surely, 2^197181855 is an apocalyptic number.

197181855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

197181855 is a deficient number, since it is larger than the sum of its proper divisors (190277217).

197181855 is a wasteful number, since it uses less digits than its factorization.

197181855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269 (or 266 counting only the distinct ones).

The product of its digits is 100800, while the sum is 45.

The square root of 197181855 is about 14042.1456693769. The cubic root of 197181855 is about 582.0437757132.

The spelling of 197181855 in words is "one hundred ninety-seven million, one hundred eighty-one thousand, eight hundred fifty-five".