51243030 has 80 divisors (see below), whose sum is σ = 141238944. Its totient is φ = 13322880.

The previous prime is 51243013. The next prime is 51243041. The reversal of 51243030 is 3034215.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 51242994 and 51243012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 32439 + ... + 33981.

Almost surely, 2^51243030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51243030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70619472).

51243030 is an abundant number, since it is smaller than the sum of its proper divisors (89995914).

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

51243030 is a wasteful number, since it uses less digits than its factorization.

51243030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1603 (or 1594 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 51243030 is about 7158.4237091695. The cubic root of 51243030 is about 371.4311023355.

Adding to 51243030 its reverse (3034215), we get a palindrome (54277245).

The spelling of 51243030 in words is "fifty-one million, two hundred forty-three thousand, thirty".