190945190197 has 4 divisors (see below), whose sum is σ = 190955302956. Its totient is φ = 190935077440.

The previous prime is 190945190167. The next prime is 190945190209. The reversal of 190945190197 is 791091549091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 791091549091 = 353 ⋅2241052547.

It can be written as a sum of positive squares in 2 ways, for example, as 170768124081 + 20177066116 = 413241^2 + 142046^2 .

It is a cyclic number.

It is not a de Polignac number, because 190945190197 - 2⁷ = 190945190069 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 (190945190167) 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, 5028004 + ... + 5065837.

It is an arithmetic number, because the mean of its divisors is an integer number (47738825739).

Almost surely, 2^190945190197 is an apocalyptic number.

It is an amenable number.

190945190197 is a deficient number, since it is larger than the sum of its proper divisors (10112759).

190945190197 is a wasteful number, since it uses less digits than its factorization.

190945190197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10112758.

The product of its (nonzero) digits is 918540, while the sum is 55.

The spelling of 190945190197 in words is "one hundred ninety billion, nine hundred forty-five million, one hundred ninety thousand, one hundred ninety-seven".