51405783 has 16 divisors (see below), whose sum is σ = 80524416. Its totient is φ = 28758240.

The previous prime is 51405779. The next prime is 51405787. The reversal of 51405783 is 38750415.

51405783 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51405779) and next prime (51405787).

It is not a de Polignac number, because 51405783 - 2² = 51405779 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51405787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59485 + ... + 60342.

It is an arithmetic number, because the mean of its divisors is an integer number (5032776).

Almost surely, 2^51405783 is an apocalyptic number.

51405783 is a deficient number, since it is larger than the sum of its proper divisors (29118633).

51405783 is a wasteful number, since it uses less digits than its factorization.

51405783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119854.

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 51405783 is about 7169.7826326884. The cubic root of 51405783 is about 371.8239208896.

The spelling of 51405783 in words is "fifty-one million, four hundred five thousand, seven hundred eighty-three".