820170469 has 2 divisors, whose sum is σ = 820170470. Its totient is φ = 820170468.

The previous prime is 820170467. The next prime is 820170493. The reversal of 820170469 is 964071028.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 661158369 + 159012100 = 25713^2 + 12610^2 .

It is a cyclic number.

It is not a de Polignac number, because 820170469 - 2¹ = 820170467 is a prime.

It is a super-2 number, since 2×820170469² = 1345359196439359922, which contains 22 as substring.

Together with 820170467, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (820170467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410085234 + 410085235.

It is an arithmetic number, because the mean of its divisors is an integer number (410085235).

Almost surely, 2^820170469 is an apocalyptic number.

It is an amenable number.

820170469 is a deficient number, since it is larger than the sum of its proper divisors (1).

820170469 is an equidigital number, since it uses as much as digits as its factorization.

820170469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 820170469 is about 28638.6184897247. The cubic root of 820170469 is about 936.0550185139.

The spelling of 820170469 in words is "eight hundred twenty million, one hundred seventy thousand, four hundred sixty-nine".