198651457 has 2 divisors, whose sum is σ = 198651458. Its totient is φ = 198651456.

The previous prime is 198651361. The next prime is 198651461. The reversal of 198651457 is 754156891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187388721 + 11262736 = 13689^2 + 3356^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198651457 is a prime.

It is not a weakly prime, because it can be changed into another prime (198651487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99325728 + 99325729.

It is an arithmetic number, because the mean of its divisors is an integer number (99325729).

Almost surely, 2^198651457 is an apocalyptic number.

It is an amenable number.

198651457 is a deficient number, since it is larger than the sum of its proper divisors (1).

198651457 is an equidigital number, since it uses as much as digits as its factorization.

198651457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 46.

The square root of 198651457 is about 14094.3767865060. The cubic root of 198651457 is about 583.4861944611.

The spelling of 198651457 in words is "one hundred ninety-eight million, six hundred fifty-one thousand, four hundred fifty-seven".