51405455 has 4 divisors (see below), whose sum is σ = 61686552. Its totient is φ = 41124360.

The previous prime is 51405413. The next prime is 51405463. The reversal of 51405455 is 55450415.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55450415 = 5 ⋅11090083.

It is not a de Polignac number, because 51405455 - 2¹² = 51401359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5140541 + ... + 5140550.

It is an arithmetic number, because the mean of its divisors is an integer number (15421638).

Almost surely, 2^51405455 is an apocalyptic number.

51405455 is a deficient number, since it is larger than the sum of its proper divisors (10281097).

51405455 is a wasteful number, since it uses less digits than its factorization.

51405455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10281096.

The product of its (nonzero) digits is 10000, while the sum is 29.

The square root of 51405455 is about 7169.7597588762. The cubic root of 51405455 is about 371.8231300674.

The spelling of 51405455 in words is "fifty-one million, four hundred five thousand, four hundred fifty-five".