7538561 has 4 divisors (see below), whose sum is σ = 7680852. Its totient is φ = 7396272.

The previous prime is 7538551. The next prime is 7538591. The reversal of 7538561 is 1658357.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1658357 = 251 ⋅6607.

It can be written as a sum of positive squares in 2 ways, for example, as 5664400 + 1874161 = 2380^2 + 1369^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7538561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7538501) 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, 71066 + ... + 71171.

It is an arithmetic number, because the mean of its divisors is an integer number (1920213).

Almost surely, 2^7538561 is an apocalyptic number.

It is an amenable number.

7538561 is a deficient number, since it is larger than the sum of its proper divisors (142291).

7538561 is a wasteful number, since it uses less digits than its factorization.

7538561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142290.

The product of its digits is 25200, while the sum is 35.

The square root of 7538561 is about 2745.6440046007. The cubic root of 7538561 is about 196.0782781182.

The spelling of 7538561 in words is "seven million, five hundred thirty-eight thousand, five hundred sixty-one".