998740261 has 2 divisors, whose sum is σ = 998740262.
Its totient is φ = 998740260.
The previous prime is 998740213. The next prime is 998740307. The reversal of 998740261 is 162047899.
998740261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is an a-pointer prime, because the next prime (998740307) can be obtained adding 998740261 to its sum of digits (46).
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 757900900 + 240839361 = 27530^2 + 15519^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-998740261 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (998744261) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499370130 + 499370131.
It is an arithmetic number, because the mean of its divisors is an integer number (499370131).
Almost surely, 2998740261 is an apocalyptic number.
It is an amenable number.
998740261 is a deficient number, since it is larger than the sum of its proper divisors (1).
998740261 is an equidigital number, since it uses as much as digits as its factorization.
998740261 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 217728, while the sum is 46.
The square root of 998740261 is about 31602.8521023024.
The cubic root of 998740261 is about 999.5799105496.
The spelling of 998740261 in words is "nine hundred ninety-eight million, seven hundred forty thousand, two hundred sixty-one".