51271660 has 48 divisors (see below), whose sum is σ = 124377120. Its totient is φ = 17546240.

The previous prime is 51271657. The next prime is 51271663. The reversal of 51271660 is 6617215.

It is an interprime number because it is at equal distance from previous prime (51271657) and next prime (51271663).

It is not an unprimeable number, because it can be changed into a prime (51271663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3115 + ... + 10594.

It is an arithmetic number, because the mean of its divisors is an integer number (2591190).

Almost surely, 2^51271660 is an apocalyptic number.

It is an amenable number.

51271660 is an abundant number, since it is smaller than the sum of its proper divisors (73105460).

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

51271660 is a wasteful number, since it uses less digits than its factorization.

51271660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13746 (or 13744 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 51271660 is about 7160.4231718523. The cubic root of 51271660 is about 371.5002635634.

Adding to 51271660 its reverse (6617215), we get a palindrome (57888875).

The spelling of 51271660 in words is "fifty-one million, two hundred seventy-one thousand, six hundred sixty".