191245457 has 16 divisors (see below), whose sum is σ = 208501440. Its totient is φ = 174370752.

The previous prime is 191245451. The next prime is 191245463. The reversal of 191245457 is 754542191.

It is an interprime number because it is at equal distance from previous prime (191245451) and next prime (191245463).

It is a cyclic number.

It is not a de Polignac number, because 191245457 - 2⁴ = 191245441 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 191245457.

It is not an unprimeable number, because it can be changed into a prime (191245451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 675638 + ... + 675920.

It is an arithmetic number, because the mean of its divisors is an integer number (13031340).

Almost surely, 2^191245457 is an apocalyptic number.

It is an amenable number.

191245457 is a deficient number, since it is larger than the sum of its proper divisors (17255983).

191245457 is a wasteful number, since it uses less digits than its factorization.

191245457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 752.

The product of its digits is 50400, while the sum is 38.

The square root of 191245457 is about 13829.1524324523. The cubic root of 191245457 is about 576.1431142344.

The spelling of 191245457 in words is "one hundred ninety-one million, two hundred forty-five thousand, four hundred fifty-seven".