4081551 has 4 divisors (see below), whose sum is σ = 5442072. Its totient is φ = 2721032.

The previous prime is 4081549. The next prime is 4081579. The reversal of 4081551 is 1551804.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 4081551 - 2¹ = 4081549 is a prime.

It is a D-number.

4081551 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4081501) 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, 680256 + ... + 680261.

It is an arithmetic number, because the mean of its divisors is an integer number (1360518).

Almost surely, 2^4081551 is an apocalyptic number.

4081551 is a deficient number, since it is larger than the sum of its proper divisors (1360521).

4081551 is a wasteful number, since it uses less digits than its factorization.

4081551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360520.

The product of its (nonzero) digits is 800, while the sum is 24.

The square root of 4081551 is about 2020.2848809017. The cubic root of 4081551 is about 159.8116403201.

It can be divided in two parts, 408155 and 1, that added together give a triangular number (408156 = T₉₀₃).

The spelling of 4081551 in words is "four million, eighty-one thousand, five hundred fifty-one".