120919491931 has 4 divisors (see below), whose sum is σ = 138193705072. Its totient is φ = 103645278792.

The previous prime is 120919491929. The next prime is 120919491977. The reversal of 120919491931 is 139194919021.

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

It is a cyclic number.

It is not a de Polignac number, because 120919491931 - 2¹ = 120919491929 is a prime.

It is a super-2 number, since 2×120919491931² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120919491911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8637106560 + ... + 8637106573.

It is an arithmetic number, because the mean of its divisors is an integer number (34548426268).

Almost surely, 2^120919491931 is an apocalyptic number.

120919491931 is a deficient number, since it is larger than the sum of its proper divisors (17274213141).

120919491931 is an equidigital number, since it uses as much as digits as its factorization.

120919491931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17274213140.

The product of its (nonzero) digits is 157464, while the sum is 49.

The spelling of 120919491931 in words is "one hundred twenty billion, nine hundred nineteen million, four hundred ninety-one thousand, nine hundred thirty-one".