50551621 has 2 divisors, whose sum is σ = 50551622. Its totient is φ = 50551620.

The previous prime is 50551597. The next prime is 50551637. The reversal of 50551621 is 12615505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38266596 + 12285025 = 6186^2 + 3505^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50551621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50551661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25275810 + 25275811.

It is an arithmetic number, because the mean of its divisors is an integer number (25275811).

Almost surely, 2^50551621 is an apocalyptic number.

It is an amenable number.

50551621 is a deficient number, since it is larger than the sum of its proper divisors (1).

50551621 is an equidigital number, since it uses as much as digits as its factorization.

50551621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 50551621 is about 7109.9663149694. The cubic root of 50551621 is about 369.7529907231.

The spelling of 50551621 in words is "fifty million, five hundred fifty-one thousand, six hundred twenty-one".