51621016 has 16 divisors (see below), whose sum is σ = 100998000. Its totient is φ = 24688224.

The previous prime is 51621013. The next prime is 51621041. The reversal of 51621016 is 61012615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51621013) 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, 140091 + ... + 140458.

It is an arithmetic number, because the mean of its divisors is an integer number (6312375).

Almost surely, 2^51621016 is an apocalyptic number.

It is an amenable number.

51621016 is a deficient number, since it is larger than the sum of its proper divisors (49376984).

51621016 is a wasteful number, since it uses less digits than its factorization.

51621016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280578 (or 280574 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 51621016 is about 7184.7766840731. The cubic root of 51621016 is about 372.3421333062.

The spelling of 51621016 in words is "fifty-one million, six hundred twenty-one thousand, sixteen".