50139421 has 2 divisors, whose sum is σ = 50139422. Its totient is φ = 50139420.

The previous prime is 50139413. The next prime is 50139457. The reversal of 50139421 is 12493105.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49702500 + 436921 = 7050^2 + 661^2 .

It is a cyclic number.

It is not a de Polignac number, because 50139421 - 2³ = 50139413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50139491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25069710 + 25069711.

It is an arithmetic number, because the mean of its divisors is an integer number (25069711).

Almost surely, 2^50139421 is an apocalyptic number.

It is an amenable number.

50139421 is a deficient number, since it is larger than the sum of its proper divisors (1).

50139421 is an equidigital number, since it uses as much as digits as its factorization.

50139421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 50139421 is about 7080.9195024375. The cubic root of 50139421 is about 368.7452529888.

The spelling of 50139421 in words is "fifty million, one hundred thirty-nine thousand, four hundred twenty-one".