191490245 has 8 divisors (see below), whose sum is σ = 229985016. Its totient is φ = 153061056.

The previous prime is 191490239. The next prime is 191490259. The reversal of 191490245 is 542094191.

It is a Cunningham number, because it is equal to 13838²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 191490244 = 1^2 + 13838^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191490245 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9722 + ... + 21851.

It is an arithmetic number, because the mean of its divisors is an integer number (28748127).

Almost surely, 2^191490245 is an apocalyptic number.

It is an amenable number.

191490245 is a deficient number, since it is larger than the sum of its proper divisors (38494771).

191490245 is a wasteful number, since it uses less digits than its factorization.

191490245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32791.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 191490245 is about 13838.0000361324. Note that the first 4 decimals coincide. The cubic root of 191490245 is about 576.3888242818.

The spelling of 191490245 in words is "one hundred ninety-one million, four hundred ninety thousand, two hundred forty-five".