7281561 has 16 divisors (see below), whose sum is σ = 11145600. Its totient is φ = 4142208.

The previous prime is 7281557. The next prime is 7281587. The reversal of 7281561 is 1651827.

It is not a de Polignac number, because 7281561 - 2² = 7281557 is a prime.

It is a super-2 number, since 2×7281561² = 106042261193442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7261561) 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, 5005 + ... + 6293.

It is an arithmetic number, because the mean of its divisors is an integer number (696600).

Almost surely, 2^7281561 is an apocalyptic number.

It is an amenable number.

7281561 is a deficient number, since it is larger than the sum of its proper divisors (3864039).

7281561 is a wasteful number, since it uses less digits than its factorization.

7281561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1568.

The product of its digits is 3360, while the sum is 30.

The square root of 7281561 is about 2698.4367696872. The cubic root of 7281561 is about 193.8242731543.

The spelling of 7281561 in words is "seven million, two hundred eighty-one thousand, five hundred sixty-one".