197751864249 has 27 divisors (see below), whose sum is σ = 287345495983. Its totient is φ = 131052805872.

The previous prime is 197751864221. The next prime is 197751864257. The reversal of 197751864249 is 942468157791.

The square root of 197751864249 is 444693.

It is a perfect power (a square), and thus also a powerful number.

197751864249 is a `hidden beast` number, since 1 + 9 + 77 + 518 + 6 + 4 + 2 + 49 = 666.

It can be written as a sum of positive squares in only one way, i.e., 46016685225 + 151735179024 = 214515^2 + 389532^2 .

It is not a de Polignac number, because 197751864249 - 2³⁵ = 163392125881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197751864049) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 302835607 + ... + 302836259.

Almost surely, 2^197751864249 is an apocalyptic number.

197751864249 is the 444693-rd square number.

197751864249 is the 222347-th centered octagonal number.

It is an amenable number.

197751864249 is a deficient number, since it is larger than the sum of its proper divisors (89593631734).

197751864249 is an frugal number, since it uses more digits than its factorization.

197751864249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1766 (or 883 counting only the distinct ones).

The product of its digits is 30481920, while the sum is 63.

The spelling of 197751864249 in words is "one hundred ninety-seven billion, seven hundred fifty-one million, eight hundred sixty-four thousand, two hundred forty-nine".