51046405 has 4 divisors (see below), whose sum is σ = 61255692. Its totient is φ = 40837120.

The previous prime is 51046399. The next prime is 51046417. The reversal of 51046405 is 50464015.

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

It can be written as a sum of positive squares in 2 ways, for example, as 24770529 + 26275876 = 4977^2 + 5126^2 .

It is not a de Polignac number, because 51046405 - 2¹³ = 51038213 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 51046405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5104636 + ... + 5104645.

It is an arithmetic number, because the mean of its divisors is an integer number (15313923).

Almost surely, 2^51046405 is an apocalyptic number.

It is an amenable number.

51046405 is a deficient number, since it is larger than the sum of its proper divisors (10209287).

51046405 is a wasteful number, since it uses less digits than its factorization.

51046405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10209286.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 51046405 is about 7144.6766896760. The cubic root of 51046405 is about 370.9554197468.

The spelling of 51046405 in words is "fifty-one million, forty-six thousand, four hundred five".