51161405 has 8 divisors (see below), whose sum is σ = 61712952. Its totient is φ = 40716288.

The previous prime is 51161387. The next prime is 51161413. The reversal of 51161405 is 50416115.

51161405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 10686361 + 40475044 = 3269^2 + 6362^2 .

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 51161405 - 2¹⁴ = 51145021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25544 + ... + 27473.

It is an arithmetic number, because the mean of its divisors is an integer number (7714119).

Almost surely, 2^51161405 is an apocalyptic number.

It is an amenable number.

51161405 is a deficient number, since it is larger than the sum of its proper divisors (10551547).

51161405 is a wasteful number, since it uses less digits than its factorization.

51161405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53215.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 51161405 is about 7152.7201119574. The cubic root of 51161405 is about 371.2337800469.

It can be divided in two parts, 511 and 61405, that added together give a palindrome (61916).

The spelling of 51161405 in words is "fifty-one million, one hundred sixty-one thousand, four hundred five".