2198657641 has 2 divisors, whose sum is σ = 2198657642. Its totient is φ = 2198657640.

The previous prime is 2198657579. The next prime is 2198657663. The reversal of 2198657641 is 1467568912.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2192206041 + 6451600 = 46821^2 + 2540^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2198657641 is a prime.

It is not a weakly prime, because it can be changed into another prime (2198651641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1099328820 + 1099328821.

It is an arithmetic number, because the mean of its divisors is an integer number (1099328821).

Almost surely, 2^2198657641 is an apocalyptic number.

It is an amenable number.

2198657641 is a deficient number, since it is larger than the sum of its proper divisors (1).

2198657641 is an equidigital number, since it uses as much as digits as its factorization.

2198657641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 49.

The square root of 2198657641 is about 46889.8458197508. The cubic root of 2198657641 is about 1300.3268686937.

The spelling of 2198657641 in words is "two billion, one hundred ninety-eight million, six hundred fifty-seven thousand, six hundred forty-one".