51081612 has 24 divisors (see below), whose sum is σ = 121440816. Its totient is φ = 16705728.

The previous prime is 51081607. The next prime is 51081619. The reversal of 51081612 is 21618015.

It is not an unprimeable number, because it can be changed into a prime (51081619) 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, 39523 + ... + 40794.

It is an arithmetic number, because the mean of its divisors is an integer number (5060034).

Almost surely, 2^51081612 is an apocalyptic number.

It is an amenable number.

51081612 is an abundant number, since it is smaller than the sum of its proper divisors (70359204).

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

51081612 is a wasteful number, since it uses less digits than its factorization.

51081612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80377 (or 80375 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 24.

The square root of 51081612 is about 7147.1401273516. The cubic root of 51081612 is about 371.0406835118.

Adding to 51081612 its reverse (21618015), we get a palindrome (72699627).

The spelling of 51081612 in words is "fifty-one million, eighty-one thousand, six hundred twelve".