651294989 has 4 divisors (see below), whose sum is σ = 656423424. Its totient is φ = 646166556.

The previous prime is 651294971. The next prime is 651294991. The reversal of 651294989 is 989492156.

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 651294989 - 2⁸ = 651294733 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 651294989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651294929) 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, 2564027 + ... + 2564280.

It is an arithmetic number, because the mean of its divisors is an integer number (164105856).

Almost surely, 2^651294989 is an apocalyptic number.

It is an amenable number.

651294989 is a deficient number, since it is larger than the sum of its proper divisors (5128435).

651294989 is a wasteful number, since it uses less digits than its factorization.

651294989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5128434.

The product of its digits is 1399680, while the sum is 53.

The square root of 651294989 is about 25520.4817548572. The cubic root of 651294989 is about 866.8139904548.

The spelling of 651294989 in words is "six hundred fifty-one million, two hundred ninety-four thousand, nine hundred eighty-nine".