51555463 has 4 divisors (see below), whose sum is σ = 51575560. Its totient is φ = 51535368.

The previous prime is 51555461. The next prime is 51555473. The reversal of 51555463 is 36455515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36455515 = 5 ⋅7291103.

It is a cyclic number.

It is not a de Polignac number, because 51555463 - 2¹ = 51555461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51555461) 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, 5520 + ... + 11557.

It is an arithmetic number, because the mean of its divisors is an integer number (12893890).

Almost surely, 2^51555463 is an apocalyptic number.

51555463 is a deficient number, since it is larger than the sum of its proper divisors (20097).

51555463 is a wasteful number, since it uses less digits than its factorization.

51555463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20096.

The product of its digits is 45000, while the sum is 34.

The square root of 51555463 is about 7180.2132976674. The cubic root of 51555463 is about 372.1844553878.

The spelling of 51555463 in words is "fifty-one million, five hundred fifty-five thousand, four hundred sixty-three".