191097993 has 8 divisors (see below), whose sum is σ = 255617856. Its totient is φ = 126988400.

The previous prime is 191097989. The next prime is 191097997. The reversal of 191097993 is 399790191.

It is an interprime number because it is at equal distance from previous prime (191097989) and next prime (191097997).

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

It is a cyclic number.

It is not a de Polignac number, because 191097993 - 2² = 191097989 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (191097997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101478 + ... + 103343.

It is an arithmetic number, because the mean of its divisors is an integer number (31952232).

Almost surely, 2^191097993 is an apocalyptic number.

It is an amenable number.

191097993 is a deficient number, since it is larger than the sum of its proper divisors (64519863).

191097993 is a wasteful number, since it uses less digits than its factorization.

191097993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205135.

The product of its (nonzero) digits is 137781, while the sum is 48.

The square root of 191097993 is about 13823.8197687904. The cubic root of 191097993 is about 575.9949935666.

The spelling of 191097993 in words is "one hundred ninety-one million, ninety-seven thousand, nine hundred ninety-three".