51193818 has 36 divisors (see below), whose sum is σ = 120115710. Its totient is φ = 15751008.

The previous prime is 51193811. The next prime is 51193843. The reversal of 51193818 is 81839115.

It can be written as a sum of positive squares in 3 ways, for example, as 10323369 + 40870449 = 3213^2 + 6393^2 .

It is not an unprimeable number, because it can be changed into a prime (51193811) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5373 + ... + 11456.

Almost surely, 2^51193818 is an apocalyptic number.

51193818 is an abundant number, since it is smaller than the sum of its proper divisors (68921892).

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

51193818 is a wasteful number, since it uses less digits than its factorization.

51193818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16863 (or 16847 counting only the distinct ones).

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

The square root of 51193818 is about 7154.9855345766. The cubic root of 51193818 is about 371.3121611384.

The spelling of 51193818 in words is "fifty-one million, one hundred ninety-three thousand, eight hundred eighteen".