197615813 has 4 divisors (see below), whose sum is σ = 197924748. Its totient is φ = 197306880.

The previous prime is 197615809. The next prime is 197615819. The reversal of 197615813 is 318516791.

197615813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 72556324 + 125059489 = 8518^2 + 11183^2 .

It is a cyclic number.

It is not a de Polignac number, because 197615813 - 2² = 197615809 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197615819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153506 + ... + 154787.

It is an arithmetic number, because the mean of its divisors is an integer number (49481187).

Almost surely, 2^197615813 is an apocalyptic number.

It is an amenable number.

197615813 is a deficient number, since it is larger than the sum of its proper divisors (308935).

197615813 is an equidigital number, since it uses as much as digits as its factorization.

197615813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308934.

The product of its digits is 45360, while the sum is 41.

The square root of 197615813 is about 14057.5891603077. The cubic root of 197615813 is about 582.4704503421.

The spelling of 197615813 in words is "one hundred ninety-seven million, six hundred fifteen thousand, eight hundred thirteen".