2097551 has 4 divisors (see below), whose sum is σ = 2107704. Its totient is φ = 2087400.

The previous prime is 2097539. The next prime is 2097559. The reversal of 2097551 is 1557902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1557902 = 2 ⋅778951.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2097551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2097559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4760 + ... + 5181.

It is an arithmetic number, because the mean of its divisors is an integer number (526926).

2^2097551 is an apocalyptic number.

2097551 is a deficient number, since it is larger than the sum of its proper divisors (10153).

2097551 is an equidigital number, since it uses as much as digits as its factorization.

2097551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10152.

The product of its (nonzero) digits is 3150, while the sum is 29.

The square root of 2097551 is about 1448.2924428443. The cubic root of 2097551 is about 128.0081171610.

The spelling of 2097551 in words is "two million, ninety-seven thousand, five hundred fifty-one".