51478519 has 2 divisors, whose sum is σ = 51478520. Its totient is φ = 51478518.

The previous prime is 51478501. The next prime is 51478591. The reversal of 51478519 is 91587415.

It is a happy number.

Together with next prime (51478591) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51478519 - 2¹¹ = 51476471 is a prime.

It is a super-2 number, since 2×51478519² = 5300075836866722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51476519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25739259 + 25739260.

It is an arithmetic number, because the mean of its divisors is an integer number (25739260).

Almost surely, 2^51478519 is an apocalyptic number.

51478519 is a deficient number, since it is larger than the sum of its proper divisors (1).

51478519 is an equidigital number, since it uses as much as digits as its factorization.

51478519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 40.

The square root of 51478519 is about 7174.8532389172. The cubic root of 51478519 is about 371.9992075175. Note that the first 3 decimals are identical.

The spelling of 51478519 in words is "fifty-one million, four hundred seventy-eight thousand, five hundred nineteen".