5111111 has 4 divisors (see below), whose sum is σ = 5197800. Its totient is φ = 5024424.

The previous prime is 5111089. The next prime is 5111123. The reversal of 5111111 is 1111115.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5111111 is a prime.

It is a super-2 number, since 2×5111111² = 52246911308642, which contains 22 as substring.

It is a Duffinian number.

5111111 is a modest number, since divided by 1111 gives 511 as remainder.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 5111092 and 5111101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5111131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43256 + ... + 43373.

It is an arithmetic number, because the mean of its divisors is an integer number (1299450).

Almost surely, 2^5111111 is an apocalyptic number.

5111111 is a deficient number, since it is larger than the sum of its proper divisors (86689).

5111111 is an equidigital number, since it uses as much as digits as its factorization.

5111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86688.

The product of its digits is 5, while the sum is 11.

The square root of 5111111 is about 2260.7766364681. The cubic root of 5111111 is about 172.2549738306.

Adding to 5111111 its reverse (1111115), we get a palindrome (6222226).

It can be divided in two parts, 5 and 111111, that multiplied together give a palindrome (555555).

The spelling of 5111111 in words is "five million, one hundred eleven thousand, one hundred eleven".