2251531218 has 16 divisors (see below), whose sum is σ = 4503562560. Its totient is φ = 750427056.

The previous prime is 2251531207. The next prime is 2251531231. The reversal of 2251531218 is 8121351522.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64696 + ... + 93212.

It is an arithmetic number, because the mean of its divisors is an integer number (281472660).

Almost surely, 2^2251531218 is an apocalyptic number.

2251531218 is an abundant number, since it is smaller than the sum of its proper divisors (2252031342).

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

2251531218 is a wasteful number, since it uses less digits than its factorization.

2251531218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41681.

The product of its digits is 4800, while the sum is 30.

The square root of 2251531218 is about 47450.3026123122. The cubic root of 2251531218 is about 1310.6678835059.

The spelling of 2251531218 in words is "two billion, two hundred fifty-one million, five hundred thirty-one thousand, two hundred eighteen".