120491643 has 4 divisors (see below), whose sum is σ = 160655528. Its totient is φ = 80327760.

The previous prime is 120491639. The next prime is 120491689. The reversal of 120491643 is 346194021.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 120491643 - 2² = 120491639 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 120491643.

It is not an unprimeable number, because it can be changed into a prime (120491603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20081938 + ... + 20081943.

It is an arithmetic number, because the mean of its divisors is an integer number (40163882).

Almost surely, 2^120491643 is an apocalyptic number.

120491643 is a deficient number, since it is larger than the sum of its proper divisors (40163885).

120491643 is an equidigital number, since it uses as much as digits as its factorization.

120491643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40163884.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 120491643 is about 10976.8685425307. The cubic root of 120491643 is about 493.9151058584.

The spelling of 120491643 in words is "one hundred twenty million, four hundred ninety-one thousand, six hundred forty-three".