51416621 has 4 divisors (see below), whose sum is σ = 51545244. Its totient is φ = 51288000.

The previous prime is 51416611. The next prime is 51416633. The reversal of 51416621 is 12661415.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41744521 + 9672100 = 6461^2 + 3110^2 .

It is a cyclic number.

It is not a de Polignac number, because 51416621 - 2¹⁰ = 51415597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51416611) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 63710 + ... + 64511.

It is an arithmetic number, because the mean of its divisors is an integer number (12886311).

Almost surely, 2^51416621 is an apocalyptic number.

It is an amenable number.

51416621 is a deficient number, since it is larger than the sum of its proper divisors (128623).

51416621 is a wasteful number, since it uses less digits than its factorization.

51416621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128622.

The product of its digits is 1440, while the sum is 26.

The square root of 51416621 is about 7170.5384037742. The cubic root of 51416621 is about 371.8500498855.

The spelling of 51416621 in words is "fifty-one million, four hundred sixteen thousand, six hundred twenty-one".