3097561 has 4 divisors (see below), whose sum is σ = 3118500. Its totient is φ = 3076624.

The previous prime is 3097547. The next prime is 3097631. The reversal of 3097561 is 1657903.

3097561 = 1244² + 1245².

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1550025 + 1547536 = 1245^2 + 1244^2 .

It is a cyclic number.

It is not a de Polignac number, because 3097561 - 2⁹ = 3097049 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3097531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10246 + ... + 10543.

It is an arithmetic number, because the mean of its divisors is an integer number (779625).

Almost surely, 2^3097561 is an apocalyptic number.

3097561 is the 1245-th centered square number.

It is an amenable number.

3097561 is a deficient number, since it is larger than the sum of its proper divisors (20939).

3097561 is a wasteful number, since it uses less digits than its factorization.

3097561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20938.

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 3097561 is about 1759.9889204197. The cubic root of 3097561 is about 145.7717237081.

The spelling of 3097561 in words is "three million, ninety-seven thousand, five hundred sixty-one".