812753489 has 4 divisors (see below), whose sum is σ = 820349424. Its totient is φ = 805157556.

The previous prime is 812753471. The next prime is 812753549. The reversal of 812753489 is 984357218.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-812753489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (812753419) 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, 3797807 + ... + 3798020.

It is an arithmetic number, because the mean of its divisors is an integer number (205087356).

Almost surely, 2^812753489 is an apocalyptic number.

It is an amenable number.

812753489 is a deficient number, since it is larger than the sum of its proper divisors (7595935).

812753489 is a wasteful number, since it uses less digits than its factorization.

812753489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7595934.

The product of its digits is 483840, while the sum is 47.

The square root of 812753489 is about 28508.8317719264. The cubic root of 812753489 is about 933.2248201933.

It can be divided in two parts, 8127 and 53489, that added together give a palindrome (61616).

The spelling of 812753489 in words is "eight hundred twelve million, seven hundred fifty-three thousand, four hundred eighty-nine".