213780405197 has 4 divisors (see below), whose sum is σ = 214248196476. Its totient is φ = 213312613920.

The previous prime is 213780405127. The next prime is 213780405211. The reversal of 213780405197 is 791504087312.

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 151014623236 + 62765781961 = 388606^2 + 250531^2 .

It is a cyclic number.

It is not a de Polignac number, because 213780405197 - 2⁸ = 213780404941 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 (213780405107) 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, 233894954 + ... + 233895867.

It is an arithmetic number, because the mean of its divisors is an integer number (53562049119).

Almost surely, 2^213780405197 is an apocalyptic number.

It is an amenable number.

213780405197 is a deficient number, since it is larger than the sum of its proper divisors (467791279).

213780405197 is an equidigital number, since it uses as much as digits as its factorization.

213780405197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467791278.

The product of its (nonzero) digits is 423360, while the sum is 47.

The spelling of 213780405197 in words is "two hundred thirteen billion, seven hundred eighty million, four hundred five thousand, one hundred ninety-seven".