198718651 has 2 divisors, whose sum is σ = 198718652. Its totient is φ = 198718650.

The previous prime is 198718631. The next prime is 198718657. The reversal of 198718651 is 156817891.

It is a strong prime.

It is an emirp because it is prime and its reverse (156817891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198718651 - 2¹³ = 198710459 is a prime.

It is not a weakly prime, because it can be changed into another prime (198718657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99359325 + 99359326.

It is an arithmetic number, because the mean of its divisors is an integer number (99359326).

Almost surely, 2^198718651 is an apocalyptic number.

198718651 is a deficient number, since it is larger than the sum of its proper divisors (1).

198718651 is an equidigital number, since it uses as much as digits as its factorization.

198718651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 46.

The square root of 198718651 is about 14096.7603015728. The cubic root of 198718651 is about 583.5519752550.

The spelling of 198718651 in words is "one hundred ninety-eight million, seven hundred eighteen thousand, six hundred fifty-one".