190393970861 has 4 divisors (see below), whose sum is σ = 192078873372. Its totient is φ = 188709068352.

The previous prime is 190393970843. The next prime is 190393970863. The reversal of 190393970861 is 168079393091.

190393970861 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 42952562500 + 147441408361 = 207250^2 + 383981^2 .

It is a cyclic number.

It is not a de Polignac number, because 190393970861 - 2¹⁰ = 190393969837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 190393970797 and 190393970806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190393970863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 842451086 + ... + 842451311.

It is an arithmetic number, because the mean of its divisors is an integer number (48019718343).

Almost surely, 2^190393970861 is an apocalyptic number.

It is an amenable number.

190393970861 is a deficient number, since it is larger than the sum of its proper divisors (1684902511).

190393970861 is a wasteful number, since it uses less digits than its factorization.

190393970861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1684902510.

The product of its (nonzero) digits is 2204496, while the sum is 56.

The spelling of 190393970861 in words is "one hundred ninety billion, three hundred ninety-three million, nine hundred seventy thousand, eight hundred sixty-one".