51366131 has 4 divisors (see below), whose sum is σ = 51423672. Its totient is φ = 51308592.

The previous prime is 51366121. The next prime is 51366137. The reversal of 51366131 is 13166315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13166315 = 5 ⋅2633263.

It is a cyclic number.

It is not a de Polignac number, because 51366131 - 2⁶ = 51366067 is a prime.

It is a super-2 number, since 2×51366131² = 5276958827818322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51366131.

It is not an unprimeable number, because it can be changed into a prime (51366137) 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, 27410 + ... + 29223.

It is an arithmetic number, because the mean of its divisors is an integer number (12855918).

Almost surely, 2^51366131 is an apocalyptic number.

51366131 is a deficient number, since it is larger than the sum of its proper divisors (57541).

51366131 is an equidigital number, since it uses as much as digits as its factorization.

51366131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57540.

The product of its digits is 1620, while the sum is 26.

The square root of 51366131 is about 7167.0168829158. The cubic root of 51366131 is about 371.7282938109.

It can be divided in two parts, 51366 and 131, that multiplied together give a triangular number (6728946 = T₃₆₆₈).

The spelling of 51366131 in words is "fifty-one million, three hundred sixty-six thousand, one hundred thirty-one".