5091986 has 4 divisors (see below), whose sum is σ = 7637982. Its totient is φ = 2545992.

The previous prime is 5091973. The next prime is 5091991. The reversal of 5091986 is 6891905.

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., 4906225 + 185761 = 2215^2 + 431^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1272995 + ... + 1272998.

Almost surely, 2^5091986 is an apocalyptic number.

5091986 is a deficient number, since it is larger than the sum of its proper divisors (2545996).

5091986 is a wasteful number, since it uses less digits than its factorization.

5091986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2545995.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 5091986 is about 2256.5429311227. The cubic root of 5091986 is about 172.0398546548.

The spelling of 5091986 in words is "five million, ninety-one thousand, nine hundred eighty-six".