819148469 has 2 divisors, whose sum is σ = 819148470. Its totient is φ = 819148468.

The previous prime is 819148441. The next prime is 819148493. The reversal of 819148469 is 964841918.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 541492900 + 277655569 = 23270^2 + 16663^2 .

It is a cyclic number.

It is not a de Polignac number, because 819148469 - 2¹² = 819144373 is a prime.

It is a super-2 number, since 2×819148469² = 1342008428530087922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (819148669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409574234 + 409574235.

It is an arithmetic number, because the mean of its divisors is an integer number (409574235).

Almost surely, 2^819148469 is an apocalyptic number.

It is an amenable number.

819148469 is a deficient number, since it is larger than the sum of its proper divisors (1).

819148469 is an equidigital number, since it uses as much as digits as its factorization.

819148469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 50.

The square root of 819148469 is about 28620.7698883171. The cubic root of 819148469 is about 935.6660563430. Note that the first 3 decimals are identical.

The spelling of 819148469 in words is "eight hundred nineteen million, one hundred forty-eight thousand, four hundred sixty-nine".