7981121 has 8 divisors (see below), whose sum is σ = 8486400. Its totient is φ = 7484400.

The previous prime is 7981087. The next prime is 7981123. The reversal of 7981121 is 1211897.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7981121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7981123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161 + ... + 3998.

It is an arithmetic number, because the mean of its divisors is an integer number (1060800).

Almost surely, 2^7981121 is an apocalyptic number.

It is an amenable number.

7981121 is a deficient number, since it is larger than the sum of its proper divisors (505279).

7981121 is a wasteful number, since it uses less digits than its factorization.

7981121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4279.

The product of its digits is 1008, while the sum is 29.

The square root of 7981121 is about 2825.0877862467. The cubic root of 7981121 is about 199.8425510817.

The spelling of 7981121 in words is "seven million, nine hundred eighty-one thousand, one hundred twenty-one".