51098798 has 4 divisors (see below), whose sum is σ = 76648200. Its totient is φ = 25549398.

The previous prime is 51098797. The next prime is 51098807. The reversal of 51098798 is 89789015.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89789015 = 5 ⋅17957803.

It is a super-2 number, since 2×51098798² = 5222174314089608, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51098797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12774698 + ... + 12774701.

It is an arithmetic number, because the mean of its divisors is an integer number (19162050).

Almost surely, 2^51098798 is an apocalyptic number.

51098798 is a deficient number, since it is larger than the sum of its proper divisors (25549402).

51098798 is a wasteful number, since it uses less digits than its factorization.

51098798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25549401.

The product of its (nonzero) digits is 181440, while the sum is 47.

The square root of 51098798 is about 7148.3423253227. The cubic root of 51098798 is about 371.0822900700.

The spelling of 51098798 in words is "fifty-one million, ninety-eight thousand, seven hundred ninety-eight".