4621981 has 12 divisors (see below), whose sum is σ = 5721312. Its totient is φ = 3656016.

The previous prime is 4621979. The next prime is 4621999. The reversal of 4621981 is 1891264.

It is a happy number.

It is not a de Polignac number, because 4621981 - 2¹ = 4621979 is a prime.

It is a super-2 number, since 2×4621981² = 42725416728722, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4621931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 771 + ... + 3136.

It is an arithmetic number, because the mean of its divisors is an integer number (476776).

Almost surely, 2^4621981 is an apocalyptic number.

It is an amenable number.

4621981 is a deficient number, since it is larger than the sum of its proper divisors (1099331).

4621981 is a wasteful number, since it uses less digits than its factorization.

4621981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3940 (or 3927 counting only the distinct ones).

The product of its digits is 3456, while the sum is 31.

The square root of 4621981 is about 2149.8792989375. The cubic root of 4621981 is about 166.5748325193.

The spelling of 4621981 in words is "four million, six hundred twenty-one thousand, nine hundred eighty-one".