4018121 has 4 divisors (see below), whose sum is σ = 4023312. Its totient is φ = 4012932.

The previous prime is 4018109. The next prime is 4018151. The reversal of 4018121 is 1218104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4018121 is a prime.

It is a super-2 number, since 2×4018121² = 32290592741282, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4018121.

It is not an unprimeable number, because it can be changed into a prime (4018151) 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, 1175 + ... + 3068.

It is an arithmetic number, because the mean of its divisors is an integer number (1005828).

Almost surely, 2^4018121 is an apocalyptic number.

It is an amenable number.

4018121 is a deficient number, since it is larger than the sum of its proper divisors (5191).

4018121 is an equidigital number, since it uses as much as digits as its factorization.

4018121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5190.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 4018121 is about 2004.5251307978. The cubic root of 4018121 is about 158.9794549090.

Subtracting from 4018121 its sum of digits (17), we obtain a palindrome (4018104).

The spelling of 4018121 in words is "four million, eighteen thousand, one hundred twenty-one".