651650989 has 4 divisors (see below), whose sum is σ = 710892000. Its totient is φ = 592409980.

The previous prime is 651650971. The next prime is 651651001. The reversal of 651650989 is 989056156.

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 not a de Polignac number, because 651650989 - 2⁵ = 651650957 is a prime.

It is a super-2 number, since 2×651650989² = 849298022929356242, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651650089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29620489 + ... + 29620510.

It is an arithmetic number, because the mean of its divisors is an integer number (177723000).

Almost surely, 2^651650989 is an apocalyptic number.

It is an amenable number.

651650989 is a deficient number, since it is larger than the sum of its proper divisors (59241011).

651650989 is a wasteful number, since it uses less digits than its factorization.

651650989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59241010.

The product of its (nonzero) digits is 583200, while the sum is 49.

The square root of 651650989 is about 25527.4555919700. The cubic root of 651650989 is about 866.9718961546.

The spelling of 651650989 in words is "six hundred fifty-one million, six hundred fifty thousand, nine hundred eighty-nine".