51121231 has 8 divisors (see below), whose sum is σ = 59027360. Its totient is φ = 43365888.

The previous prime is 51121163. The next prime is 51121237. The reversal of 51121231 is 13212115.

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

It is a cyclic number.

It is not a de Polignac number, because 51121231 - 2¹¹ = 51119183 is a prime.

It is a super-2 number, since 2×51121231² = 5226760517910722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51121237) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 36966 + ... + 38323.

It is an arithmetic number, because the mean of its divisors is an integer number (7378420).

Almost surely, 2^51121231 is an apocalyptic number.

51121231 is a deficient number, since it is larger than the sum of its proper divisors (7906129).

51121231 is an equidigital number, since it uses as much as digits as its factorization.

51121231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75393.

The product of its digits is 60, while the sum is 16.

The square root of 51121231 is about 7149.9112581906. The cubic root of 51121231 is about 371.1365853532.

Adding to 51121231 its reverse (13212115), we get a palindrome (64333346).

The spelling of 51121231 in words is "fifty-one million, one hundred twenty-one thousand, two hundred thirty-one".