51212825 has 12 divisors (see below), whose sum is σ = 64220220. Its totient is φ = 40508160.

The previous prime is 51212803. The next prime is 51212827. The reversal of 51212825 is 52821215.

It can be written as a sum of positive squares in 6 ways, for example, as 4276624 + 46936201 = 2068^2 + 6851^2 .

It is not a de Polignac number, because 51212825 - 2¹⁴ = 51196441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51212794 and 51212803.

It is not an unprimeable number, because it can be changed into a prime (51212827) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9284 + ... + 13733.

It is an arithmetic number, because the mean of its divisors is an integer number (5351685).

Almost surely, 2^51212825 is an apocalyptic number.

It is an amenable number.

51212825 is a deficient number, since it is larger than the sum of its proper divisors (13007395).

51212825 is a wasteful number, since it uses less digits than its factorization.

51212825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23116 (or 23111 counting only the distinct ones).

The product of its digits is 1600, while the sum is 26.

The square root of 51212825 is about 7156.3136460052. The cubic root of 51212825 is about 371.3581084636.

The spelling of 51212825 in words is "fifty-one million, two hundred twelve thousand, eight hundred twenty-five".