120947891 has 4 divisors (see below), whose sum is σ = 121296792. Its totient is φ = 120598992.

The previous prime is 120947887. The next prime is 120947899. The reversal of 120947891 is 198749021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198749021 = 1613 ⋅123217.

It is a cyclic number.

It is not a de Polignac number, because 120947891 - 2² = 120947887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120947899) 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, 173930 + ... + 174623.

It is an arithmetic number, because the mean of its divisors is an integer number (30324198).

Almost surely, 2^120947891 is an apocalyptic number.

120947891 is a deficient number, since it is larger than the sum of its proper divisors (348901).

120947891 is an equidigital number, since it uses as much as digits as its factorization.

120947891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348900.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 120947891 is about 10997.6311540259. The cubic root of 120947891 is about 494.5377325679.

The spelling of 120947891 in words is "one hundred twenty million, nine hundred forty-seven thousand, eight hundred ninety-one".