191002201 has 4 divisors (see below), whose sum is σ = 205694692. Its totient is φ = 176309712.

The previous prime is 191002181. The next prime is 191002261. The reversal of 191002201 is 102200191.

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 27290176 + 163712025 = 5224^2 + 12795^2 .

It is a cyclic number.

It is not a de Polignac number, because 191002201 - 2⁷ = 191002073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191002261) 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, 7346226 + ... + 7346251.

It is an arithmetic number, because the mean of its divisors is an integer number (51423673).

Almost surely, 2^191002201 is an apocalyptic number.

It is an amenable number.

191002201 is a deficient number, since it is larger than the sum of its proper divisors (14692491).

191002201 is a wasteful number, since it uses less digits than its factorization.

191002201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14692490.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 191002201 is about 13820.3545902412. The cubic root of 191002201 is about 575.8987341668.

Adding to 191002201 its reverse (102200191), we get a palindrome (293202392).

The spelling of 191002201 in words is "one hundred ninety-one million, two thousand, two hundred one".