51171605 has 4 divisors (see below), whose sum is σ = 61405932. Its totient is φ = 40937280.

The previous prime is 51171583. The next prime is 51171691. The reversal of 51171605 is 50617115.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50617115 = 5 ⋅10123423.

It can be written as a sum of positive squares in 2 ways, for example, as 23902321 + 27269284 = 4889^2 + 5222^2 .

It is a de Polignac number, because none of the positive numbers 2^k-51171605 is a prime.

It is a super-3 number, since 3×51171605³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

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 3 ways as a sum of consecutive naturals, for example, 5117156 + ... + 5117165.

It is an arithmetic number, because the mean of its divisors is an integer number (15351483).

Almost surely, 2^51171605 is an apocalyptic number.

It is an amenable number.

51171605 is a deficient number, since it is larger than the sum of its proper divisors (10234327).

51171605 is a wasteful number, since it uses less digits than its factorization.

51171605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10234326.

The product of its (nonzero) digits is 1050, while the sum is 26.

The square root of 51171605 is about 7153.4330918797. The cubic root of 51171605 is about 371.2584492479.

The spelling of 51171605 in words is "fifty-one million, one hundred seventy-one thousand, six hundred five".