5551581 has 16 divisors (see below), whose sum is σ = 8515584. Its totient is φ = 3151344.

The previous prime is 5551531. The next prime is 5551583. The reversal of 5551581 is 1851555.

It is not a de Polignac number, because 5551581 - 2⁷ = 5551453 is a prime.

It is a super-2 number, since 2×5551581² = 61640103199122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5551583) 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, 2716 + ... + 4298.

It is an arithmetic number, because the mean of its divisors is an integer number (532224).

Almost surely, 2^5551581 is an apocalyptic number.

It is an amenable number.

5551581 is a deficient number, since it is larger than the sum of its proper divisors (2964003).

5551581 is a wasteful number, since it uses less digits than its factorization.

5551581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1760.

The product of its digits is 5000, while the sum is 30.

The square root of 5551581 is about 2356.1793225474. The cubic root of 5551581 is about 177.0675154991.

The spelling of 5551581 in words is "five million, five hundred fifty-one thousand, five hundred eighty-one".