51009012 has 36 divisors (see below), whose sum is σ = 133101696. Its totient is φ = 16454160.

The previous prime is 51009001. The next prime is 51009031. The reversal of 51009012 is 21090015.

51009012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×51009012² = 5203838610432288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21738 + ... + 23969.

Almost surely, 2^51009012 is an apocalyptic number.

It is an amenable number.

51009012 is an abundant number, since it is smaller than the sum of its proper divisors (82092684).

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

51009012 is a wasteful number, since it uses less digits than its factorization.

51009012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45748 (or 45743 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 51009012 is about 7142.0593668773. The cubic root of 51009012 is about 370.8648190186.

Adding to 51009012 its reverse (21090015), we get a palindrome (72099027).

The spelling of 51009012 in words is "fifty-one million, nine thousand, twelve".