189813195361 has 2 divisors, whose sum is σ = 189813195362. Its totient is φ = 189813195360.

The previous prime is 189813195359. The next prime is 189813195529. The reversal of 189813195361 is 163591318981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161990955361 + 27822240000 = 402481^2 + 166800^2 .

It is a cyclic number.

It is not a de Polignac number, because 189813195361 - 2¹ = 189813195359 is a prime.

Together with 189813195359, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (189813195301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94906597680 + 94906597681.

It is an arithmetic number, because the mean of its divisors is an integer number (94906597681).

Almost surely, 2^189813195361 is an apocalyptic number.

It is an amenable number.

189813195361 is a deficient number, since it is larger than the sum of its proper divisors (1).

189813195361 is an equidigital number, since it uses as much as digits as its factorization.

189813195361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1399680, while the sum is 55.

The spelling of 189813195361 in words is "one hundred eighty-nine billion, eight hundred thirteen million, one hundred ninety-five thousand, three hundred sixty-one".