820609507 has 2 divisors, whose sum is σ = 820609508. Its totient is φ = 820609506.

The previous prime is 820609477. The next prime is 820609513. The reversal of 820609507 is 705906028.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 820609507 - 2⁷ = 820609379 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (820609597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410304753 + 410304754.

It is an arithmetic number, because the mean of its divisors is an integer number (410304754).

Almost surely, 2^820609507 is an apocalyptic number.

820609507 is a deficient number, since it is larger than the sum of its proper divisors (1).

820609507 is an equidigital number, since it uses as much as digits as its factorization.

820609507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 820609507 is about 28646.2826035072. The cubic root of 820609507 is about 936.2220124218. Note that the first 3 decimals are identical.

The spelling of 820609507 in words is "eight hundred twenty million, six hundred nine thousand, five hundred seven".