3081921 has 8 divisors (see below), whose sum is σ = 4148064. Its totient is φ = 2035200.

The previous prime is 3081919. The next prime is 3081937. The reversal of 3081921 is 1291803.

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

It is not a de Polignac number, because 3081921 - 2¹ = 3081919 is a prime.

3081921 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3081891 and 3081900.

It is not an unprimeable number, because it can be changed into a prime (3081901) 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, 4480 + ... + 5121.

It is an arithmetic number, because the mean of its divisors is an integer number (518508).

Almost surely, 2^3081921 is an apocalyptic number.

It is an amenable number.

3081921 is a deficient number, since it is larger than the sum of its proper divisors (1066143).

3081921 is a wasteful number, since it uses less digits than its factorization.

3081921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9711.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 3081921 is about 1755.5400878362. The cubic root of 3081921 is about 145.5259693139.

The spelling of 3081921 in words is "three million, eighty-one thousand, nine hundred twenty-one".