998740181 has 2 divisors, whose sum is σ = 998740182. Its totient is φ = 998740180.

The previous prime is 998740153. The next prime is 998740189. The reversal of 998740181 is 181047899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 563350225 + 435389956 = 23735^2 + 20866^2 .

It is a cyclic number.

It is not a de Polignac number, because 998740181 - 2⁶ = 998740117 is a prime.

It is a super-2 number, since 2×998740181² = 1994963898287825522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998740189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499370090 + 499370091.

It is an arithmetic number, because the mean of its divisors is an integer number (499370091).

Almost surely, 2^998740181 is an apocalyptic number.

It is an amenable number.

998740181 is a deficient number, since it is larger than the sum of its proper divisors (1).

998740181 is an equidigital number, since it uses as much as digits as its factorization.

998740181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 47.

The square root of 998740181 is about 31602.8508365938. The cubic root of 998740181 is about 999.5798838605.

The spelling of 998740181 in words is "nine hundred ninety-eight million, seven hundred forty thousand, one hundred eighty-one".