50891986 has 4 divisors (see below), whose sum is σ = 76337982. Its totient is φ = 25445992.

The previous prime is 50891969. The next prime is 50892041. The reversal of 50891986 is 68919805.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 49266361 + 1625625 = 7019^2 + 1275^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12722995 + ... + 12722998.

Almost surely, 2^50891986 is an apocalyptic number.

50891986 is a deficient number, since it is larger than the sum of its proper divisors (25445996).

50891986 is a wasteful number, since it uses less digits than its factorization.

50891986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25445995.

The product of its (nonzero) digits is 155520, while the sum is 46.

The square root of 50891986 is about 7133.8619274556. The cubic root of 50891986 is about 370.5809864346.

The spelling of 50891986 in words is "fifty million, eight hundred ninety-one thousand, nine hundred eighty-six".