820629197 has 2 divisors, whose sum is σ = 820629198. Its totient is φ = 820629196.

The previous prime is 820629193. The next prime is 820629283. The reversal of 820629197 is 791926028.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 524135236 + 296493961 = 22894^2 + 17219^2 .

It is a cyclic number.

It is not a de Polignac number, because 820629197 - 2² = 820629193 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (820629193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410314598 + 410314599.

It is an arithmetic number, because the mean of its divisors is an integer number (410314599).

Almost surely, 2^820629197 is an apocalyptic number.

It is an amenable number.

820629197 is a deficient number, since it is larger than the sum of its proper divisors (1).

820629197 is an equidigital number, since it uses as much as digits as its factorization.

820629197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 820629197 is about 28646.6262760556. The cubic root of 820629197 is about 936.2295003780.

The spelling of 820629197 in words is "eight hundred twenty million, six hundred twenty-nine thousand, one hundred ninety-seven".