191940553 has 4 divisors (see below), whose sum is σ = 219360640. Its totient is φ = 164520468.

The previous prime is 191940521. The next prime is 191940599. The reversal of 191940553 is 355049191.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 355049191 = 7 ⋅50721313.

It is not a de Polignac number, because 191940553 - 2⁵ = 191940521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191940503) 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, 13710033 + ... + 13710046.

It is an arithmetic number, because the mean of its divisors is an integer number (54840160).

Almost surely, 2^191940553 is an apocalyptic number.

It is an amenable number.

191940553 is a deficient number, since it is larger than the sum of its proper divisors (27420087).

191940553 is an equidigital number, since it uses as much as digits as its factorization.

191940553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27420086.

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 191940553 is about 13854.2611856425. The cubic root of 191940553 is about 576.8402821088.

The spelling of 191940553 in words is "one hundred ninety-one million, nine hundred forty thousand, five hundred fifty-three".