51121611 has 24 divisors (see below), whose sum is σ = 77575680. Its totient is φ = 33637032.

The previous prime is 51121597. The next prime is 51121613. The reversal of 51121611 is 11612115.

It is a happy number.

51121611 is a `hidden beast` number, since 51 + 1 + 2 + 1 + 611 = 666.

It is not a de Polignac number, because 51121611 - 2⁵ = 51121579 is a prime.

It is a super-2 number, since 2×51121611² = 5226838222470642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51121613) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17866 + ... + 20528.

It is an arithmetic number, because the mean of its divisors is an integer number (3232320).

Almost surely, 2^51121611 is an apocalyptic number.

51121611 is a deficient number, since it is larger than the sum of its proper divisors (26454069).

51121611 is an equidigital number, since it uses as much as digits as its factorization.

51121611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2757 (or 2745 counting only the distinct ones).

The product of its digits is 60, while the sum is 18.

The square root of 51121611 is about 7149.9378318976. The cubic root of 51121611 is about 371.1375049422.

Adding to 51121611 its reverse (11612115), we get a palindrome (62733726).

It can be divided in two parts, 511 and 21611, that added together give a palindrome (22122).

The spelling of 51121611 in words is "fifty-one million, one hundred twenty-one thousand, six hundred eleven".