819198451 has 2 divisors, whose sum is σ = 819198452. Its totient is φ = 819198450.

The previous prime is 819198439. The next prime is 819198473. The reversal of 819198451 is 154891918.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 819198451 - 2⁷ = 819198323 is a prime.

It is a super-2 number, since 2×819198451² = 1342172204241598802, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (816198451) 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, 409599225 + 409599226.

It is an arithmetic number, because the mean of its divisors is an integer number (409599226).

Almost surely, 2^819198451 is an apocalyptic number.

819198451 is a deficient number, since it is larger than the sum of its proper divisors (1).

819198451 is an equidigital number, since it uses as much as digits as its factorization.

819198451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 46.

The square root of 819198451 is about 28621.6430520681. The cubic root of 819198451 is about 935.6850864747.

The spelling of 819198451 in words is "eight hundred nineteen million, one hundred ninety-eight thousand, four hundred fifty-one".