651631446 has 64 divisors (see below), whose sum is σ = 1516838400. Its totient is φ = 206968608.

The previous prime is 651631441. The next prime is 651631447. The reversal of 651631446 is 644136156.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 651631446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651631441) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 380440 + ... + 382148.

It is an arithmetic number, because the mean of its divisors is an integer number (23700600).

Almost surely, 2^651631446 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 651631446, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (758419200).

651631446 is an abundant number, since it is smaller than the sum of its proper divisors (865206954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

651631446 is a wasteful number, since it uses less digits than its factorization.

651631446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2050 (or 2044 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 651631446 is about 25527.0728051612. The cubic root of 651631446 is about 866.9632292447.

The spelling of 651631446 in words is "six hundred fifty-one million, six hundred thirty-one thousand, four hundred forty-six".