51581012 has 24 divisors (see below), whose sum is σ = 103318656. Its totient is φ = 22072608.

The previous prime is 51580981. The next prime is 51581017. The reversal of 51581012 is 21018515.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51581017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28898 + ... + 30630.

It is an arithmetic number, because the mean of its divisors is an integer number (4304944).

Almost surely, 2^51581012 is an apocalyptic number.

It is an amenable number.

51581012 is an abundant number, since it is smaller than the sum of its proper divisors (51737644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51581012 is a wasteful number, since it uses less digits than its factorization.

51581012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2807 (or 2805 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 23.

The square root of 51581012 is about 7181.9922027248. The cubic root of 51581012 is about 372.2459255649.

Adding to 51581012 its reverse (21018515), we get a palindrome (72599527).

The spelling of 51581012 in words is "fifty-one million, five hundred eighty-one thousand, twelve".