651085889 has 4 divisors (see below), whose sum is σ = 651683760. Its totient is φ = 650488020.

The previous prime is 651085871. The next prime is 651085921. The reversal of 651085889 is 988580156.

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-651085889 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (651085849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 297299 + ... + 299480.

It is an arithmetic number, because the mean of its divisors is an integer number (162920940).

Almost surely, 2^651085889 is an apocalyptic number.

It is an amenable number.

651085889 is a deficient number, since it is larger than the sum of its proper divisors (597871).

651085889 is a wasteful number, since it uses less digits than its factorization.

651085889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597870.

The product of its (nonzero) digits is 691200, while the sum is 50.

The square root of 651085889 is about 25516.3847164915. The cubic root of 651085889 is about 866.7212162082.

The spelling of 651085889 in words is "six hundred fifty-one million, eighty-five thousand, eight hundred eighty-nine".