51261705 has 48 divisors (see below), whose sum is σ = 100301760. Its totient is φ = 23990400.

The previous prime is 51261703. The next prime is 51261709. The reversal of 51261705 is 50716215.

It is not a de Polignac number, because 51261705 - 2¹ = 51261703 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51261703) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12570 + ... + 16140.

It is an arithmetic number, because the mean of its divisors is an integer number (2089620).

Almost surely, 2^51261705 is an apocalyptic number.

51261705 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51261705 is a deficient number, since it is larger than the sum of its proper divisors (49040055).

51261705 is a wasteful number, since it uses less digits than its factorization.

51261705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3622 (or 3619 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 51261705 is about 7159.7279976267. The cubic root of 51261705 is about 371.4762182818.

Subtracting from 51261705 its reverse (50716215), we obtain a triangular number (545490 = T₁₀₄₄).

The spelling of 51261705 in words is "fifty-one million, two hundred sixty-one thousand, seven hundred five".