4005551 has 4 divisors (see below), whose sum is σ = 4369704. Its totient is φ = 3641400.

The previous prime is 4005539. The next prime is 4005553. The reversal of 4005551 is 1555004.

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 4005551 - 2¹⁰ = 4004527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4005553) 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, 182060 + ... + 182081.

It is an arithmetic number, because the mean of its divisors is an integer number (1092426).

Almost surely, 2^4005551 is an apocalyptic number.

4005551 is a deficient number, since it is larger than the sum of its proper divisors (364153).

4005551 is a wasteful number, since it uses less digits than its factorization.

4005551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364152.

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 4005551 is about 2001.3872688713. The cubic root of 4005551 is about 158.8135017822.

The spelling of 4005551 in words is "four million, five thousand, five hundred fifty-one".