51405707 has 4 divisors (see below), whose sum is σ = 52375680. Its totient is φ = 50435736.

The previous prime is 51405701. The next prime is 51405709. The reversal of 51405707 is 70750415.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51405707 - 2¹² = 51401611 is a prime.

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 51405707.

It is not an unprimeable number, because it can be changed into a prime (51405701) by changing a digit.

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, 484907 + ... + 485012.

It is an arithmetic number, because the mean of its divisors is an integer number (13093920).

Almost surely, 2^51405707 is an apocalyptic number.

51405707 is a deficient number, since it is larger than the sum of its proper divisors (969973).

51405707 is an equidigital number, since it uses as much as digits as its factorization.

51405707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 969972.

The product of its (nonzero) digits is 4900, while the sum is 29.

The square root of 51405707 is about 7169.7773326652. Note that the first 3 decimals coincide. The cubic root of 51405707 is about 371.8237376506.

The spelling of 51405707 in words is "fifty-one million, four hundred five thousand, seven hundred seven".