7081581 has 16 divisors (see below), whose sum is σ = 10269504. Its totient is φ = 4314624.

The previous prime is 7081579. The next prime is 7081589. The reversal of 7081581 is 1851807.

7081581 is digitally balanced in base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 7081581 - 2¹ = 7081579 is a prime.

It is a super-2 number, since 2×7081581² = 100297578919122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7081589) 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, 3325 + ... + 5021.

It is an arithmetic number, because the mean of its divisors is an integer number (641844).

Almost surely, 2^7081581 is an apocalyptic number.

It is an amenable number.

7081581 is a deficient number, since it is larger than the sum of its proper divisors (3187923).

7081581 is a wasteful number, since it uses less digits than its factorization.

7081581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1820.

The product of its (nonzero) digits is 2240, while the sum is 30.

The square root of 7081581 is about 2661.1240106391. The cubic root of 7081581 is about 192.0333872061.

The spelling of 7081581 in words is "seven million, eighty-one thousand, five hundred eighty-one".