197507813 has 8 divisors (see below), whose sum is σ = 206173560. Its totient is φ = 189017280.

The previous prime is 197507803. The next prime is 197507833. The reversal of 197507813 is 318705791.

197507813 = 9937² + 9938².

It can be written as a sum of positive squares in 4 ways, for example, as 69772609 + 127735204 = 8353^2 + 11302^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 197507813 - 2¹⁴ = 197491429 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197507803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41498 + ... + 46011.

It is an arithmetic number, because the mean of its divisors is an integer number (25771695).

Almost surely, 2^197507813 is an apocalyptic number.

197507813 is the 9938-th centered square number.

It is an amenable number.

197507813 is a deficient number, since it is larger than the sum of its proper divisors (8665747).

197507813 is an equidigital number, since it uses as much as digits as its factorization.

197507813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87607.

The product of its (nonzero) digits is 52920, while the sum is 41.

The square root of 197507813 is about 14053.7472938715. The cubic root of 197507813 is about 582.3643213993.

The spelling of 197507813 in words is "one hundred ninety-seven million, five hundred seven thousand, eight hundred thirteen".