51111101 has 4 divisors (see below), whose sum is σ = 51183900. Its totient is φ = 51038304.

The previous prime is 51111089. The next prime is 51111103. The reversal of 51111101 is 10111115.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 22231225 + 28879876 = 4715^2 + 5374^2 .

It is a cyclic number.

It is not a de Polignac number, because 51111101 - 2¹⁸ = 50848957 is a prime.

It is a super-2 number, since 2×51111101² = 5224689290864402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51111103) 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, 35336 + ... + 36753.

It is an arithmetic number, because the mean of its divisors is an integer number (12795975).

Almost surely, 2^51111101 is an apocalyptic number.

It is an amenable number.

51111101 is a deficient number, since it is larger than the sum of its proper divisors (72799).

51111101 is an equidigital number, since it uses as much as digits as its factorization.

51111101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72798.

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

The square root of 51111101 is about 7149.2028226929. The cubic root of 51111101 is about 371.1120693684.

Adding to 51111101 its reverse (10111115), we get a palindrome (61222216).

The spelling of 51111101 in words is "fifty-one million, one hundred eleven thousand, one hundred one".