51120252 has 36 divisors (see below), whose sum is σ = 129958920. Its totient is φ = 16942752.

The previous prime is 51120227. The next prime is 51120253. The reversal of 51120252 is 25202115.

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

It is a super-2 number, since 2×51120252² = 5226560329087008, 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 not an unprimeable number, because it can be changed into a prime (51120253) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2478 + ... + 10410.

It is an arithmetic number, because the mean of its divisors is an integer number (3609970).

Almost surely, 2^51120252 is an apocalyptic number.

It is an amenable number.

51120252 is an abundant number, since it is smaller than the sum of its proper divisors (78838668).

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

51120252 is a wasteful number, since it uses less digits than its factorization.

51120252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8122 (or 8117 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 51120252 is about 7149.8427954746. The cubic root of 51120252 is about 371.1342161808.

Adding to 51120252 its reverse (25202115), we get a palindrome (76322367).

The spelling of 51120252 in words is "fifty-one million, one hundred twenty thousand, two hundred fifty-two".