50687991 has 16 divisors (see below), whose sum is σ = 79046400. Its totient is φ = 32013144.

The previous prime is 50687977. The next prime is 50687993. The reversal of 50687991 is 19978605.

It is not a de Polignac number, because 50687991 - 2¹⁰ = 50686967 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50687993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48891 + ... + 49916.

It is an arithmetic number, because the mean of its divisors is an integer number (4940400).

Almost surely, 2^50687991 is an apocalyptic number.

50687991 is a deficient number, since it is larger than the sum of its proper divisors (28358409).

50687991 is a wasteful number, since it uses less digits than its factorization.

50687991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98835 (or 98829 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 50687991 is about 7119.5499155494. The cubic root of 50687991 is about 370.0851788309.

The spelling of 50687991 in words is "fifty million, six hundred eighty-seven thousand, nine hundred ninety-one".