4019121 has 6 divisors (see below), whose sum is σ = 5805410. Its totient is φ = 2679408.

The previous prime is 4019117. The next prime is 4019131. The reversal of 4019121 is 1219104.

It can be written as a sum of positive squares in only one way, i.e., 2852721 + 1166400 = 1689^2 + 1080^2 .

It is not a de Polignac number, because 4019121 - 2² = 4019117 is a prime.

It is a super-2 number, since 2×4019121² = 32306667225282, which contains 22 as substring.

It is a Duffinian number.

4019121 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 4019094 and 4019103.

It is not an unprimeable number, because it can be changed into a prime (4019101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 223276 + ... + 223293.

Almost surely, 2^4019121 is an apocalyptic number.

It is an amenable number.

4019121 is a deficient number, since it is larger than the sum of its proper divisors (1786289).

4019121 is a wasteful number, since it uses less digits than its factorization.

4019121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446575 (or 446572 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 4019121 is about 2004.7745509159. The cubic root of 4019121 is about 158.9926423556.

The spelling of 4019121 in words is "four million, nineteen thousand, one hundred twenty-one".