197856513 has 10 divisors (see below), whose sum is σ = 295563554. Its totient is φ = 131904288.

The previous prime is 197856493. The next prime is 197856517. The reversal of 197856513 is 315658791.

It is a happy number.

197856513 is a `hidden beast` number, since 1 + 9 + 78 + 565 + 13 = 666.

It can be written as a sum of positive squares in only one way, i.e., 154927809 + 42928704 = 12447^2 + 6552^2 .

It is not a de Polignac number, because 197856513 - 2¹⁶ = 197790977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197856517) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1221256 + ... + 1221417.

Almost surely, 2^197856513 is an apocalyptic number.

It is an amenable number.

197856513 is a deficient number, since it is larger than the sum of its proper divisors (97707041).

197856513 is an equidigital number, since it uses as much as digits as its factorization.

197856513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2442685 (or 2442676 counting only the distinct ones).

The product of its digits is 226800, while the sum is 45.

The square root of 197856513 is about 14066.1477668905. The cubic root of 197856513 is about 582.7068412654.

The spelling of 197856513 in words is "one hundred ninety-seven million, eight hundred fifty-six thousand, five hundred thirteen".