51304405 has 4 divisors (see below), whose sum is σ = 61565292. Its totient is φ = 41043520.

The previous prime is 51304399. The next prime is 51304423. The reversal of 51304405 is 50440315.

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 37234404 + 14070001 = 6102^2 + 3751^2 .

It is not a de Polignac number, because 51304405 - 2³ = 51304397 is a prime.

It is a super-3 number, since 3×51304405³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

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, 5130436 + ... + 5130445.

It is an arithmetic number, because the mean of its divisors is an integer number (15391323).

Almost surely, 2^51304405 is an apocalyptic number.

It is an amenable number.

51304405 is a deficient number, since it is larger than the sum of its proper divisors (10260887).

51304405 is a wasteful number, since it uses less digits than its factorization.

51304405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10260886.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 51304405 is about 7162.7093337647. The cubic root of 51304405 is about 371.5793338031.

The spelling of 51304405 in words is "fifty-one million, three hundred four thousand, four hundred five".