120991834945 has 8 divisors (see below), whose sum is σ = 145193991336. Its totient is φ = 96790941696.

The previous prime is 120991834919. The next prime is 120991834963. The reversal of 120991834945 is 549438199021.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 83493836209 + 37497998736 = 288953^2 + 193644^2 .

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 120991834945 - 2³³ = 112401900353 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90432 + ... + 500161.

It is an arithmetic number, because the mean of its divisors is an integer number (18149248917).

Almost surely, 2^120991834945 is an apocalyptic number.

It is an amenable number.

120991834945 is a deficient number, since it is larger than the sum of its proper divisors (24202156391).

120991834945 is an equidigital number, since it uses as much as digits as its factorization.

120991834945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631571.

The product of its (nonzero) digits is 2799360, while the sum is 55.

The spelling of 120991834945 in words is "one hundred twenty billion, nine hundred ninety-one million, eight hundred thirty-four thousand, nine hundred forty-five".