2097561 has 4 divisors (see below), whose sum is σ = 2796752. Its totient is φ = 1398372.

The previous prime is 2097559. The next prime is 2097593. The reversal of 2097561 is 1657902.

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 not a de Polignac number, because 2097561 - 2¹ = 2097559 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2097461) 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, 349591 + ... + 349596.

It is an arithmetic number, because the mean of its divisors is an integer number (699188).

2^2097561 is an apocalyptic number.

It is an amenable number.

2097561 is a deficient number, since it is larger than the sum of its proper divisors (699191).

2097561 is an equidigital number, since it uses as much as digits as its factorization.

2097561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699190.

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 2097561 is about 1448.2958951816. The cubic root of 2097561 is about 128.0083205854.

The spelling of 2097561 in words is "two million, ninety-seven thousand, five hundred sixty-one".