51085825 has 24 divisors (see below), whose sum is σ = 73493312. Its totient is φ = 34499520.

The previous prime is 51085823. The next prime is 51085841. The reversal of 51085825 is 52858015.

It is a happy number.

It is not a de Polignac number, because 51085825 - 2¹ = 51085823 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51085823) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9547 + ... + 13903.

Almost surely, 2^51085825 is an apocalyptic number.

It is an amenable number.

51085825 is a deficient number, since it is larger than the sum of its proper divisors (22407487).

51085825 is a wasteful number, since it uses less digits than its factorization.

51085825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4441 (or 4436 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 34.

The square root of 51085825 is about 7147.4348545475. The cubic root of 51085825 is about 371.0508838648.

The spelling of 51085825 in words is "fifty-one million, eighty-five thousand, eight hundred twenty-five".