998135401 has 2 divisors, whose sum is σ = 998135402. Its totient is φ = 998135400.

The previous prime is 998135389. The next prime is 998135407. The reversal of 998135401 is 104531899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 993825625 + 4309776 = 31525^2 + 2076^2 .

It is an emirp because it is prime and its reverse (104531899) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998135401 is a prime.

It is not a weakly prime, because it can be changed into another prime (998135407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499067700 + 499067701.

It is an arithmetic number, because the mean of its divisors is an integer number (499067701).

Almost surely, 2^998135401 is an apocalyptic number.

It is an amenable number.

998135401 is a deficient number, since it is larger than the sum of its proper divisors (1).

998135401 is an equidigital number, since it uses as much as digits as its factorization.

998135401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 998135401 is about 31593.2809470621. The cubic root of 998135401 is about 999.3780802961.

The spelling of 998135401 in words is "nine hundred ninety-eight million, one hundred thirty-five thousand, four hundred one".