51571020 has 48 divisors (see below), whose sum is σ = 145903968. Its totient is φ = 13608960.

The previous prime is 51570983. The next prime is 51571021. The reversal of 51571020 is 2017515.

It is not an unprimeable number, because it can be changed into a prime (51571021) 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, 1390 + ... + 10250.

It is an arithmetic number, because the mean of its divisors is an integer number (3039666).

Almost surely, 2^51571020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51571020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72951984).

51571020 is an abundant number, since it is smaller than the sum of its proper divisors (94332948).

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

51571020 is a wasteful number, since it uses less digits than its factorization.

51571020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8970 (or 8968 counting only the distinct ones).

The product of its (nonzero) digits is 350, while the sum is 21.

The square root of 51571020 is about 7181.2965403192. The cubic root of 51571020 is about 372.2218875107.

Adding to 51571020 its reverse (2017515), we get a palindrome (53588535).

The spelling of 51571020 in words is "fifty-one million, five hundred seventy-one thousand, twenty".