4151869 has 4 divisors (see below), whose sum is σ = 4156380. Its totient is φ = 4147360.

The previous prime is 4151821. The next prime is 4151879. The reversal of 4151869 is 9681514.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9681514 = 2 ⋅4840757.

It can be written as a sum of positive squares in 2 ways, for example, as 3286969 + 864900 = 1813^2 + 930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4151869 is a prime.

It is a super-2 number, since 2×4151869² = 34476032386322, which contains 22 as substring.

It is a Duffinian number.

4151869 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4151809) 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, 322 + ... + 2899.

It is an arithmetic number, because the mean of its divisors is an integer number (1039095).

It is a Poulet number, since it divides 2^4151868-1.

Almost surely, 2^4151869 is an apocalyptic number.

4151869 is the 1289-th heptagonal number.

It is an amenable number.

4151869 is a deficient number, since it is larger than the sum of its proper divisors (4511).

4151869 is a wasteful number, since it uses less digits than its factorization.

4151869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4510.

The product of its digits is 8640, while the sum is 34.

The square root of 4151869 is about 2037.6135551178. The cubic root of 4151869 is about 160.7241782788.

It can be divided in two parts, 415 and 1869, that multiplied together give a triangular number (775635 = T₁₂₄₅).

The spelling of 4151869 in words is "four million, one hundred fifty-one thousand, eight hundred sixty-nine".