51781118 has 12 divisors (see below), whose sum is σ = 81975960. Its totient is φ = 24527556.

The previous prime is 51781117. The next prime is 51781123. The reversal of 51781118 is 81118715.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51781111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35138 + ... + 36581.

It is an arithmetic number, because the mean of its divisors is an integer number (6831330).

Almost surely, 2^51781118 is an apocalyptic number.

51781118 is a deficient number, since it is larger than the sum of its proper divisors (30194842).

51781118 is a wasteful number, since it uses less digits than its factorization.

51781118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71759 (or 71740 counting only the distinct ones).

The product of its digits is 2240, while the sum is 32.

The square root of 51781118 is about 7195.9098104409. The cubic root of 51781118 is about 372.7266743415.

The spelling of 51781118 in words is "fifty-one million, seven hundred eighty-one thousand, one hundred eighteen".