198611953 has 2 divisors, whose sum is σ = 198611954. Its totient is φ = 198611952.

The previous prime is 198611951. The next prime is 198611971. The reversal of 198611953 is 359116891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108513889 + 90098064 = 10417^2 + 9492^2 .

It is a cyclic number.

It is not a de Polignac number, because 198611953 - 2¹ = 198611951 is a prime.

Together with 198611951, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (198611951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99305976 + 99305977.

It is an arithmetic number, because the mean of its divisors is an integer number (99305977).

Almost surely, 2^198611953 is an apocalyptic number.

It is an amenable number.

198611953 is a deficient number, since it is larger than the sum of its proper divisors (1).

198611953 is an equidigital number, since it uses as much as digits as its factorization.

198611953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 43.

The square root of 198611953 is about 14092.9753068683. The cubic root of 198611953 is about 583.4475143745.

The spelling of 198611953 in words is "one hundred ninety-eight million, six hundred eleven thousand, nine hundred fifty-three".