50139491 has 2 divisors, whose sum is σ = 50139492. Its totient is φ = 50139490.

The previous prime is 50139457. The next prime is 50139497. The reversal of 50139491 is 19493105.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 50139491 - 2²² = 45945187 is a prime.

It is not a weakly prime, because it can be changed into another prime (50139497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25069745 + 25069746.

It is an arithmetic number, because the mean of its divisors is an integer number (25069746).

Almost surely, 2^50139491 is an apocalyptic number.

50139491 is a deficient number, since it is larger than the sum of its proper divisors (1).

50139491 is an equidigital number, since it uses as much as digits as its factorization.

50139491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 50139491 is about 7080.9244452967. The cubic root of 50139491 is about 368.7454245913.

The spelling of 50139491 in words is "fifty million, one hundred thirty-nine thousand, four hundred ninety-one".