51405601 has 8 divisors (see below), whose sum is σ = 56405160. Its totient is φ = 46555392.

The previous prime is 51405589. The next prime is 51405619. The reversal of 51405601 is 10650415.

It can be written as a sum of positive squares in 4 ways, for example, as 17007376 + 34398225 = 4124^2 + 5865^2 .

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

It is not a de Polignac number, because 51405601 - 2¹¹ = 51403553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51405401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36616 + ... + 37993.

It is an arithmetic number, because the mean of its divisors is an integer number (7050645).

Almost surely, 2^51405601 is an apocalyptic number.

It is an amenable number.

51405601 is a deficient number, since it is larger than the sum of its proper divisors (4999559).

51405601 is a wasteful number, since it uses less digits than its factorization.

51405601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74675.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 51405601 is about 7169.7699405211. The cubic root of 51405601 is about 371.8234820801.

The spelling of 51405601 in words is "fifty-one million, four hundred five thousand, six hundred one".