5105991 has 8 divisors (see below), whose sum is σ = 7426944. Its totient is φ = 3094520.

The previous prime is 5105981. The next prime is 5105993. The reversal of 5105991 is 1995015.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 5105991 - 2¹⁴ = 5089607 is a prime.

It is a super-2 number, since 2×5105991² = 52142288184162, which contains 22 as substring.

5105991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5105993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77331 + ... + 77396.

It is an arithmetic number, because the mean of its divisors is an integer number (928368).

Almost surely, 2^5105991 is an apocalyptic number.

5105991 is a deficient number, since it is larger than the sum of its proper divisors (2320953).

5105991 is a wasteful number, since it uses less digits than its factorization.

5105991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154741.

The product of its (nonzero) digits is 2025, while the sum is 30.

The square root of 5105991 is about 2259.6439985095. The cubic root of 5105991 is about 172.1974364300.

The spelling of 5105991 in words is "five million, one hundred five thousand, nine hundred ninety-one".