5671581 has 4 divisors (see below), whose sum is σ = 7562112. Its totient is φ = 3781052.

The previous prime is 5671579. The next prime is 5671609. The reversal of 5671581 is 1851765.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 5671581 - 2¹ = 5671579 is a prime.

It is a super-2 number, since 2×5671581² = 64333662079122, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5671511) 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, 945261 + ... + 945266.

It is an arithmetic number, because the mean of its divisors is an integer number (1890528).

Almost surely, 2^5671581 is an apocalyptic number.

It is an amenable number.

5671581 is a deficient number, since it is larger than the sum of its proper divisors (1890531).

5671581 is a wasteful number, since it uses less digits than its factorization.

5671581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1890530.

The product of its digits is 8400, while the sum is 33.

The square root of 5671581 is about 2381.5081356149. The cubic root of 5671581 is about 178.3342308356.

The spelling of 5671581 in words is "five million, six hundred seventy-one thousand, five hundred eighty-one".