51021265 has 16 divisors (see below), whose sum is σ = 62251200. Its totient is φ = 40139712.

The previous prime is 51021241. The next prime is 51021307. The reversal of 51021265 is 56212015.

It is a cyclic number.

It is not a de Polignac number, because 51021265 - 2¹⁷ = 50890193 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 97294 + ... + 97816.

It is an arithmetic number, because the mean of its divisors is an integer number (3890700).

Almost surely, 2^51021265 is an apocalyptic number.

It is an amenable number.

51021265 is a deficient number, since it is larger than the sum of its proper divisors (11229935).

51021265 is a wasteful number, since it uses less digits than its factorization.

51021265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816.

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

The square root of 51021265 is about 7142.9171211768. The cubic root of 51021265 is about 370.8945120907.

The spelling of 51021265 in words is "fifty-one million, twenty-one thousand, two hundred sixty-five".