51265821 has 8 divisors (see below), whose sum is σ = 68406784. Its totient is φ = 34151040.

The previous prime is 51265817. The next prime is 51265843. The reversal of 51265821 is 12856215.

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

It is not a de Polignac number, because 51265821 - 2² = 51265817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51265871) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1396 + ... + 10221.

It is an arithmetic number, because the mean of its divisors is an integer number (8550848).

Almost surely, 2^51265821 is an apocalyptic number.

It is an amenable number.

51265821 is a deficient number, since it is larger than the sum of its proper divisors (17140963).

51265821 is a wasteful number, since it uses less digits than its factorization.

51265821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13091.

The product of its digits is 4800, while the sum is 30.

The square root of 51265821 is about 7160.0154329443. The cubic root of 51265821 is about 371.4861604351.

The spelling of 51265821 in words is "fifty-one million, two hundred sixty-five thousand, eight hundred twenty-one".