198417289261 has 2 divisors, whose sum is σ = 198417289262. Its totient is φ = 198417289260.

The previous prime is 198417289219. The next prime is 198417289271. The reversal of 198417289261 is 162982714891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197119128361 + 1298160900 = 443981^2 + 36030^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198417289261 is a prime.

It is a super-2 number, since 2×198417289261² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 198417289196 and 198417289205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198417289271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99208644630 + 99208644631.

It is an arithmetic number, because the mean of its divisors is an integer number (99208644631).

Almost surely, 2^198417289261 is an apocalyptic number.

It is an amenable number.

198417289261 is a deficient number, since it is larger than the sum of its proper divisors (1).

198417289261 is an equidigital number, since it uses as much as digits as its factorization.

198417289261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3483648, while the sum is 58.

The spelling of 198417289261 in words is "one hundred ninety-eight billion, four hundred seventeen million, two hundred eighty-nine thousand, two hundred sixty-one".