2698240261 has 4 divisors (see below), whose sum is σ = 2702642572. Its totient is φ = 2693837952.

The previous prime is 2698240253. The next prime is 2698240297. The reversal of 2698240261 is 1620428962.

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 17589636 + 2680650625 = 4194^2 + 51775^2 .

It is a cyclic number.

It is not a de Polignac number, because 2698240261 - 2³ = 2698240253 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 (2698240201) 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, 2200236 + ... + 2201461.

It is an arithmetic number, because the mean of its divisors is an integer number (675660643).

Almost surely, 2^2698240261 is an apocalyptic number.

It is an amenable number.

2698240261 is a deficient number, since it is larger than the sum of its proper divisors (4402311).

2698240261 is an equidigital number, since it uses as much as digits as its factorization.

2698240261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4402310.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 2698240261 is about 51944.5883706859. The cubic root of 2698240261 is about 1392.1740663785.

The spelling of 2698240261 in words is "two billion, six hundred ninety-eight million, two hundred forty thousand, two hundred sixty-one".