810465947 has 4 divisors (see below), whose sum is σ = 823752336. Its totient is φ = 797179560.

The previous prime is 810465941. The next prime is 810465967. The reversal of 810465947 is 749564018.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 810465947 - 2¹⁶ = 810400411 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 810465898 and 810465907.

It is not an unprimeable number, because it can be changed into a prime (810465941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6643103 + ... + 6643224.

It is an arithmetic number, because the mean of its divisors is an integer number (205938084).

Almost surely, 2^810465947 is an apocalyptic number.

810465947 is a deficient number, since it is larger than the sum of its proper divisors (13286389).

810465947 is a wasteful number, since it uses less digits than its factorization.

810465947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13286388.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 810465947 is about 28468.6836190225. The cubic root of 810465947 is about 932.3484589639.

The spelling of 810465947 in words is "eight hundred ten million, four hundred sixty-five thousand, nine hundred forty-seven".