998920451 has 2 divisors, whose sum is σ = 998920452. Its totient is φ = 998920450.

The previous prime is 998920441. The next prime is 998920463. The reversal of 998920451 is 154029899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 998920451 - 2⁶ = 998920387 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 998920396 and 998920405.

It is not a weakly prime, because it can be changed into another prime (998920411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499460225 + 499460226.

It is an arithmetic number, because the mean of its divisors is an integer number (499460226).

Almost surely, 2^998920451 is an apocalyptic number.

998920451 is the 14135-th centered decagonal number.

998920451 is a deficient number, since it is larger than the sum of its proper divisors (1).

998920451 is an equidigital number, since it uses as much as digits as its factorization.

998920451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 47.

The square root of 998920451 is about 31605.7028240158. The cubic root of 998920451 is about 999.6400207638.

The spelling of 998920451 in words is "nine hundred ninety-eight million, nine hundred twenty thousand, four hundred fifty-one".