51503818 has 8 divisors (see below), whose sum is σ = 77939748. Its totient is φ = 25523904.

The previous prime is 51503807. The next prime is 51503819. The reversal of 51503818 is 81830515.

It can be written as a sum of positive squares in 2 ways, for example, as 48902049 + 2601769 = 6993^2 + 1613^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-4 number, since 4×51503818⁴ (a number of 32 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51503818.

It is not an unprimeable number, because it can be changed into a prime (51503819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113721 + ... + 114172.

Almost surely, 2^51503818 is an apocalyptic number.

51503818 is a deficient number, since it is larger than the sum of its proper divisors (26435930).

51503818 is a wasteful number, since it uses less digits than its factorization.

51503818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228008.

The product of its (nonzero) digits is 4800, while the sum is 31.

The square root of 51503818 is about 7176.6160549384. The cubic root of 51503818 is about 372.0601369229.

The spelling of 51503818 in words is "fifty-one million, five hundred three thousand, eight hundred eighteen".