810239897 has 2 divisors, whose sum is σ = 810239898. Its totient is φ = 810239896.

The previous prime is 810239893. The next prime is 810239939. The reversal of 810239897 is 798932018.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 803665801 + 6574096 = 28349^2 + 2564^2 .

It is a cyclic number.

It is not a de Polignac number, because 810239897 - 2² = 810239893 is a prime.

It is not a weakly prime, because it can be changed into another prime (810239893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405119948 + 405119949.

It is an arithmetic number, because the mean of its divisors is an integer number (405119949).

Almost surely, 2^810239897 is an apocalyptic number.

It is an amenable number.

810239897 is a deficient number, since it is larger than the sum of its proper divisors (1).

810239897 is an equidigital number, since it uses as much as digits as its factorization.

810239897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 47.

The square root of 810239897 is about 28464.7131901939. The cubic root of 810239897 is about 932.2617693391.

The spelling of 810239897 in words is "eight hundred ten million, two hundred thirty-nine thousand, eight hundred ninety-seven".