51799621 has 2 divisors, whose sum is σ = 51799622. Its totient is φ = 51799620.

The previous prime is 51799619. The next prime is 51799637. The reversal of 51799621 is 12699715.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41139396 + 10660225 = 6414^2 + 3265^2 .

It is a cyclic number.

It is not a de Polignac number, because 51799621 - 2¹ = 51799619 is a prime.

Together with 51799619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51799661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25899810 + 25899811.

It is an arithmetic number, because the mean of its divisors is an integer number (25899811).

Almost surely, 2^51799621 is an apocalyptic number.

It is an amenable number.

51799621 is a deficient number, since it is larger than the sum of its proper divisors (1).

51799621 is an equidigital number, since it uses as much as digits as its factorization.

51799621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34020, while the sum is 40.

The square root of 51799621 is about 7197.1953565260. The cubic root of 51799621 is about 372.7710646562.

The spelling of 51799621 in words is "fifty-one million, seven hundred ninety-nine thousand, six hundred twenty-one".