51991622 has 16 divisors (see below), whose sum is σ = 80559360. Its totient is φ = 25152192.

The previous prime is 51991603. The next prime is 51991631. The reversal of 51991622 is 22619915.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4379 + ... + 11097.

It is an arithmetic number, because the mean of its divisors is an integer number (5034960).

Almost surely, 2^51991622 is an apocalyptic number.

51991622 is a deficient number, since it is larger than the sum of its proper divisors (28567738).

51991622 is a wasteful number, since it uses less digits than its factorization.

51991622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6847.

The product of its digits is 9720, while the sum is 35.

The square root of 51991622 is about 7210.5216177472. The cubic root of 51991622 is about 373.2310691061.

The spelling of 51991622 in words is "fifty-one million, nine hundred ninety-one thousand, six hundred twenty-two".