51550405 has 8 divisors (see below), whose sum is σ = 61918200. Its totient is φ = 41201856.

The previous prime is 51550393. The next prime is 51550417. The reversal of 51550405 is 50405515.

It is an interprime number because it is at equal distance from previous prime (51550393) and next prime (51550417).

It can be written as a sum of positive squares in 4 ways, for example, as 29778849 + 21771556 = 5457^2 + 4666^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51550405 - 2⁷ = 51550277 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51550405.

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 7 ways as a sum of consecutive naturals, for example, 1951 + ... + 10339.

It is an arithmetic number, because the mean of its divisors is an integer number (7739775).

Almost surely, 2^51550405 is an apocalyptic number.

It is an amenable number.

51550405 is a deficient number, since it is larger than the sum of its proper divisors (10367795).

51550405 is a wasteful number, since it uses less digits than its factorization.

51550405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9623.

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 51550405 is about 7179.8610710793. The cubic root of 51550405 is about 372.1722835737.

The spelling of 51550405 in words is "fifty-one million, five hundred fifty thousand, four hundred five".