190985615243 has 4 divisors (see below), whose sum is σ = 190996979328. Its totient is φ = 190974251160.

The previous prime is 190985615239. The next prime is 190985615251. The reversal of 190985615243 is 342516589091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342516589091 = 266867 ⋅1283473.

It is a cyclic number.

It is not a de Polignac number, because 190985615243 - 2² = 190985615239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (190985615213) 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, 5656796 + ... + 5690457.

It is an arithmetic number, because the mean of its divisors is an integer number (47749244832).

Almost surely, 2^190985615243 is an apocalyptic number.

190985615243 is a deficient number, since it is larger than the sum of its proper divisors (11364085).

190985615243 is a wasteful number, since it uses less digits than its factorization.

190985615243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11364084.

The product of its (nonzero) digits is 2332800, while the sum is 53.

The spelling of 190985615243 in words is "one hundred ninety billion, nine hundred eighty-five million, six hundred fifteen thousand, two hundred forty-three".