50551639 has 2 divisors, whose sum is σ = 50551640. Its totient is φ = 50551638.

The previous prime is 50551637. The next prime is 50551661. The reversal of 50551639 is 93615505.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 50551639 - 2¹ = 50551637 is a prime.

Together with 50551637, 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 (50551637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25275819 + 25275820.

It is an arithmetic number, because the mean of its divisors is an integer number (25275820).

Almost surely, 2^50551639 is an apocalyptic number.

50551639 is a deficient number, since it is larger than the sum of its proper divisors (1).

50551639 is an equidigital number, since it uses as much as digits as its factorization.

50551639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20250, while the sum is 34.

The square root of 50551639 is about 7109.9675807981. The cubic root of 50551639 is about 369.7530346093.

The spelling of 50551639 in words is "fifty million, five hundred fifty-one thousand, six hundred thirty-nine".