120991323 has 4 divisors (see below), whose sum is σ = 161321768. Its totient is φ = 80660880.

The previous prime is 120991307. The next prime is 120991327. The reversal of 120991323 is 323199021.

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: 323199021 = 3 ⋅107733007.

It is not a de Polignac number, because 120991323 - 2⁴ = 120991307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120991327) 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, 20165218 + ... + 20165223.

It is an arithmetic number, because the mean of its divisors is an integer number (40330442).

Almost surely, 2^120991323 is an apocalyptic number.

120991323 is a deficient number, since it is larger than the sum of its proper divisors (40330445).

120991323 is an equidigital number, since it uses as much as digits as its factorization.

120991323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40330444.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 120991323 is about 10999.6055838380. The cubic root of 120991323 is about 494.5969211219.

The spelling of 120991323 in words is "one hundred twenty million, nine hundred ninety-one thousand, three hundred twenty-three".