101103991 has 4 divisors (see below), whose sum is σ = 103569984. Its totient is φ = 98638000.

The previous prime is 101103983. The next prime is 101104007. The reversal of 101103991 is 199301101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199301101 = 3011 ⋅66191.

It is a cyclic number.

It is not a de Polignac number, because 101103991 - 2³ = 101103983 is a prime.

It is a super-2 number, since 2×101103991² = 20444033992256162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101103941) 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, 1232935 + ... + 1233016.

It is an arithmetic number, because the mean of its divisors is an integer number (25892496).

Almost surely, 2^101103991 is an apocalyptic number.

101103991 is a deficient number, since it is larger than the sum of its proper divisors (2465993).

101103991 is an equidigital number, since it uses as much as digits as its factorization.

101103991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2465992.

The product of its (nonzero) digits is 243, while the sum is 25.

The square root of 101103991 is about 10055.0480356883. The cubic root of 101103991 is about 465.8607266752.

The spelling of 101103991 in words is "one hundred one million, one hundred three thousand, nine hundred ninety-one".