4157121 has 16 divisors (see below), whose sum is σ = 5823360. Its totient is φ = 2634240.

The previous prime is 4157119. The next prime is 4157123. The reversal of 4157121 is 1217514.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (4157119) and next prime (4157123).

It is not a de Polignac number, because 4157121 - 2¹ = 4157119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4157123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5841 + ... + 6513.

It is an arithmetic number, because the mean of its divisors is an integer number (363960).

Almost surely, 2^4157121 is an apocalyptic number.

It is an amenable number.

4157121 is a deficient number, since it is larger than the sum of its proper divisors (1666239).

4157121 is a wasteful number, since it uses less digits than its factorization.

4157121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776.

The product of its digits is 280, while the sum is 21.

The square root of 4157121 is about 2038.9019103429. The cubic root of 4157121 is about 160.7919202767.

It can be divided in two parts, 4157 and 121, that added together give a triangular number (4278 = T₉₂).

The spelling of 4157121 in words is "four million, one hundred fifty-seven thousand, one hundred twenty-one".