51641621 has 2 divisors, whose sum is σ = 51641622. Its totient is φ = 51641620.

The previous prime is 51641549. The next prime is 51641633. The reversal of 51641621 is 12614615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51638596 + 3025 = 7186^2 + 55^2 .

It is a cyclic number.

It is not a de Polignac number, because 51641621 - 2¹⁴ = 51625237 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51640621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25820810 + 25820811.

It is an arithmetic number, because the mean of its divisors is an integer number (25820811).

Almost surely, 2^51641621 is an apocalyptic number.

It is an amenable number.

51641621 is a deficient number, since it is larger than the sum of its proper divisors (1).

51641621 is an equidigital number, since it uses as much as digits as its factorization.

51641621 is an odious number, because the sum of its binary digits is odd.

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

The square root of 51641621 is about 7186.2104756262. The cubic root of 51641621 is about 372.3916679705.

The spelling of 51641621 in words is "fifty-one million, six hundred forty-one thousand, six hundred twenty-one".