198970853 has 2 divisors, whose sum is σ = 198970854. Its totient is φ = 198970852.

The previous prime is 198970843. The next prime is 198970859. The reversal of 198970853 is 358079891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 162766564 + 36204289 = 12758^2 + 6017^2 .

It is a cyclic number.

It is not a de Polignac number, because 198970853 - 2¹⁰ = 198969829 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198970859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99485426 + 99485427.

It is an arithmetic number, because the mean of its divisors is an integer number (99485427).

Almost surely, 2^198970853 is an apocalyptic number.

It is an amenable number.

198970853 is a deficient number, since it is larger than the sum of its proper divisors (1).

198970853 is an equidigital number, since it uses as much as digits as its factorization.

198970853 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 50.

The square root of 198970853 is about 14105.7028538106. The cubic root of 198970853 is about 583.7987408157.

The spelling of 198970853 in words is "one hundred ninety-eight million, nine hundred seventy thousand, eight hundred fifty-three".