50138991 has 24 divisors (see below), whose sum is σ = 83245344. Its totient is φ = 28486080.

The previous prime is 50138969. The next prime is 50139029. The reversal of 50138991 is 19983105.

It is a happy number.

It is not a de Polignac number, because 50138991 - 2⁶ = 50138927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50138791) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9205 + ... + 13601.

It is an arithmetic number, because the mean of its divisors is an integer number (3468556).

Almost surely, 2^50138991 is an apocalyptic number.

50138991 is a deficient number, since it is larger than the sum of its proper divisors (33106353).

50138991 is a wasteful number, since it uses less digits than its factorization.

50138991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4591 (or 4588 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 50138991 is about 7080.8891390842. The cubic root of 50138991 is about 368.7441988554.

The spelling of 50138991 in words is "fifty million, one hundred thirty-eight thousand, nine hundred ninety-one".