51051220 has 24 divisors (see below), whose sum is σ = 116954208. Its totient is φ = 18564000.

The previous prime is 51051179. The next prime is 51051241. The reversal of 51051220 is 2215015.

It is a junction number, because it is equal to n+sod(n) for n = 51051194 and 51051203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115806 + ... + 116245.

It is an arithmetic number, because the mean of its divisors is an integer number (4873092).

Almost surely, 2^51051220 is an apocalyptic number.

It is an amenable number.

51051220 is an abundant number, since it is smaller than the sum of its proper divisors (65902988).

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

51051220 is a wasteful number, since it uses less digits than its factorization.

51051220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232071 (or 232069 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 51051220 is about 7145.0136458932. The cubic root of 51051220 is about 370.9670829527.

Adding to 51051220 its reverse (2215015), we get a palindrome (53266235).

The spelling of 51051220 in words is "fifty-one million, fifty-one thousand, two hundred twenty".