651621244 has 24 divisors (see below), whose sum is σ = 1157925888. Its totient is φ = 320797680.

The previous prime is 651621227. The next prime is 651621247. The reversal of 651621244 is 442126156.

It is a happy number.

It is a super-2 number, since 2×651621244² = 849220491264215072, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651621247) 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 7 ways as a sum of consecutive naturals, for example, 421537 + ... + 423079.

It is an arithmetic number, because the mean of its divisors is an integer number (48246912).

Almost surely, 2^651621244 is an apocalyptic number.

It is an amenable number.

651621244 is a deficient number, since it is larger than the sum of its proper divisors (506304644).

651621244 is a wasteful number, since it uses less digits than its factorization.

651621244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3105 (or 3103 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The square root of 651621244 is about 25526.8729773155. The cubic root of 651621244 is about 866.9587048033.

The spelling of 651621244 in words is "six hundred fifty-one million, six hundred twenty-one thousand, two hundred forty-four".