819381029 has 2 divisors, whose sum is σ = 819381030. Its totient is φ = 819381028.

The previous prime is 819381001. The next prime is 819381041. The reversal of 819381029 is 920183918.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 661878529 + 157502500 = 25727^2 + 12550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-819381029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (819383029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409690514 + 409690515.

It is an arithmetic number, because the mean of its divisors is an integer number (409690515).

Almost surely, 2^819381029 is an apocalyptic number.

It is an amenable number.

819381029 is a deficient number, since it is larger than the sum of its proper divisors (1).

819381029 is an equidigital number, since it uses as much as digits as its factorization.

819381029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 819381029 is about 28624.8323837887. The cubic root of 819381029 is about 935.7545945902.

The spelling of 819381029 in words is "eight hundred nineteen million, three hundred eighty-one thousand, twenty-nine".