51243516 has 60 divisors (see below), whose sum is σ = 135282840. Its totient is φ = 16912800.

The previous prime is 51243503. The next prime is 51243523. The reversal of 51243516 is 61534215.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 51243516.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 34591 + ... + 36041.

It is an arithmetic number, because the mean of its divisors is an integer number (2254714).

Almost surely, 2^51243516 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 51243516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67641420).

51243516 is an abundant number, since it is smaller than the sum of its proper divisors (84039324).

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

51243516 is a wasteful number, since it uses less digits than its factorization.

51243516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1576 (or 1565 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 51243516 is about 7158.4576551098. The cubic root of 51243516 is about 371.4322765762.

The spelling of 51243516 in words is "fifty-one million, two hundred forty-three thousand, five hundred sixteen".