197215755 has 16 divisors (see below), whose sum is σ = 344231424. Its totient is φ = 95619680.

The previous prime is 197215751. The next prime is 197215757. The reversal of 197215755 is 557512791.

It is not a de Polignac number, because 197215755 - 2² = 197215751 is a prime.

It is not an unprimeable number, because it can be changed into a prime (197215751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 597459 + ... + 597788.

It is an arithmetic number, because the mean of its divisors is an integer number (21514464).

Almost surely, 2^197215755 is an apocalyptic number.

197215755 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

197215755 is a deficient number, since it is larger than the sum of its proper divisors (147015669).

197215755 is a wasteful number, since it uses less digits than its factorization.

197215755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1195266.

The product of its digits is 110250, while the sum is 42.

The square root of 197215755 is about 14043.3526979849. The cubic root of 197215755 is about 582.0771292780.

The spelling of 197215755 in words is "one hundred ninety-seven million, two hundred fifteen thousand, seven hundred fifty-five".