651046805 has 4 divisors (see below), whose sum is σ = 781256172. Its totient is φ = 520837440.

The previous prime is 651046793. The next prime is 651046811. The reversal of 651046805 is 508640156.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 366416164 + 284630641 = 19142^2 + 16871^2 .

It is not a de Polignac number, because 651046805 - 2²² = 646852501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65104676 + ... + 65104685.

It is an arithmetic number, because the mean of its divisors is an integer number (195314043).

Almost surely, 2^651046805 is an apocalyptic number.

It is an amenable number.

651046805 is a deficient number, since it is larger than the sum of its proper divisors (130209367).

651046805 is a wasteful number, since it uses less digits than its factorization.

651046805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130209366.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 651046805 is about 25515.6188441511. The cubic root of 651046805 is about 866.7038730740.

The spelling of 651046805 in words is "six hundred fifty-one million, forty-six thousand, eight hundred five".