998979481 has 2 divisors, whose sum is σ = 998979482. Its totient is φ = 998979480.

The previous prime is 998979479. The next prime is 998979491. The reversal of 998979481 is 184979899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 963171225 + 35808256 = 31035^2 + 5984^2 .

It is a cyclic number.

It is not a de Polignac number, because 998979481 - 2¹ = 998979479 is a prime.

It is a super-2 number, since 2×998979481² = 1995920006918058722, which contains 22 as substring.

Together with 998979479, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (998979491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499489740 + 499489741.

It is an arithmetic number, because the mean of its divisors is an integer number (499489741).

Almost surely, 2^998979481 is an apocalyptic number.

It is an amenable number.

998979481 is a deficient number, since it is larger than the sum of its proper divisors (1).

998979481 is an equidigital number, since it uses as much as digits as its factorization.

998979481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11757312, while the sum is 64.

The square root of 998979481 is about 31606.6366606762. The cubic root of 998979481 is about 999.6597112167.

The spelling of 998979481 in words is "nine hundred ninety-eight million, nine hundred seventy-nine thousand, four hundred eighty-one".