51621033 has 8 divisors (see below), whose sum is σ = 69064128. Its totient is φ = 34295984.

The previous prime is 51621013. The next prime is 51621041. The reversal of 51621033 is 33012615.

51621033 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51621033 - 2¹² = 51616937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51621013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28485 + ... + 30242.

It is an arithmetic number, because the mean of its divisors is an integer number (8633016).

Almost surely, 2^51621033 is an apocalyptic number.

It is an amenable number.

51621033 is a deficient number, since it is larger than the sum of its proper divisors (17443095).

51621033 is a wasteful number, since it uses less digits than its factorization.

51621033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59023.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 51621033 is about 7184.7778671299. Note that the first 3 decimals coincide. The cubic root of 51621033 is about 372.3421741799.

Adding to 51621033 its reverse (33012615), we get a palindrome (84633648).

The spelling of 51621033 in words is "fifty-one million, six hundred twenty-one thousand, thirty-three".