2198318761 has 2 divisors, whose sum is σ = 2198318762. Its totient is φ = 2198318760.

The previous prime is 2198318747. The next prime is 2198318783. The reversal of 2198318761 is 1678138912.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1722250000 + 476068761 = 41500^2 + 21819^2 .

It is a cyclic number.

It is not a de Polignac number, because 2198318761 - 2¹⁵ = 2198285993 is a prime.

It is not a weakly prime, because it can be changed into another prime (2198318261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1099159380 + 1099159381.

It is an arithmetic number, because the mean of its divisors is an integer number (1099159381).

Almost surely, 2^2198318761 is an apocalyptic number.

It is an amenable number.

2198318761 is a deficient number, since it is larger than the sum of its proper divisors (1).

2198318761 is an equidigital number, since it uses as much as digits as its factorization.

2198318761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 46.

The square root of 2198318761 is about 46886.2321049581. The cubic root of 2198318761 is about 1300.2600586240.

The spelling of 2198318761 in words is "two billion, one hundred ninety-eight million, three hundred eighteen thousand, seven hundred sixty-one".