51030018 has 24 divisors (see below), whose sum is σ = 119070588. Its totient is φ = 15701472.

The previous prime is 51030017. The next prime is 51030037. The reversal of 51030018 is 81003015.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 51022449 + 7569 = 7143^2 + 87^2 .

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

It is not an unprimeable number, because it can be changed into a prime (51030013) 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, 108805 + ... + 109272.

Almost surely, 2^51030018 is an apocalyptic number.

51030018 is an abundant number, since it is smaller than the sum of its proper divisors (68040570).

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

51030018 is a wasteful number, since it uses less digits than its factorization.

51030018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218098 (or 218095 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 51030018 is about 7143.5297997559. The cubic root of 51030018 is about 370.9157205942.

The spelling of 51030018 in words is "fifty-one million, thirty thousand, eighteen".