51181398 has 12 divisors (see below), whose sum is σ = 110893068. Its totient is φ = 17060460.

The previous prime is 51181387. The next prime is 51181423. The reversal of 51181398 is 89318115.

51181398 is a `hidden beast` number, since 511 + 8 + 139 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1421688 + ... + 1421723.

It is an arithmetic number, because the mean of its divisors is an integer number (9241089).

Almost surely, 2^51181398 is an apocalyptic number.

51181398 is an abundant number, since it is smaller than the sum of its proper divisors (59711670).

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

51181398 is a wasteful number, since it uses less digits than its factorization.

51181398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2843419 (or 2843416 counting only the distinct ones).

The product of its digits is 8640, while the sum is 36.

The square root of 51181398 is about 7154.1175556458. The cubic root of 51181398 is about 371.2821310149.

The spelling of 51181398 in words is "fifty-one million, one hundred eighty-one thousand, three hundred ninety-eight".