101194991 has 4 divisors (see below), whose sum is σ = 102705432. Its totient is φ = 99684552.

The previous prime is 101194987. The next prime is 101195023. The reversal of 101194991 is 199491101.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199491101 = 293 ⋅680857.

It is a cyclic number.

It is not a de Polignac number, because 101194991 - 2² = 101194987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101194981) 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 3 ways as a sum of consecutive naturals, for example, 755120 + ... + 755253.

It is an arithmetic number, because the mean of its divisors is an integer number (25676358).

Almost surely, 2^101194991 is an apocalyptic number.

101194991 is a deficient number, since it is larger than the sum of its proper divisors (1510441).

101194991 is an equidigital number, since it uses as much as digits as its factorization.

101194991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1510440.

The product of its (nonzero) digits is 2916, while the sum is 35.

The square root of 101194991 is about 10059.5721081963. The cubic root of 101194991 is about 466.0004528230. Note that the first 3 decimals are identical.

The spelling of 101194991 in words is "one hundred one million, one hundred ninety-four thousand, nine hundred ninety-one".