51997898 has 4 divisors (see below), whose sum is σ = 77996850. Its totient is φ = 25998948.

The previous prime is 51997873. The next prime is 51997901. The reversal of 51997898 is 89879915.

It is a happy number.

51997898 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89879915 = 5 ⋅17975983.

It can be written as a sum of positive squares in only one way, i.e., 30217009 + 21780889 = 5497^2 + 4667^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12999473 + ... + 12999476.

Almost surely, 2^51997898 is an apocalyptic number.

51997898 is a deficient number, since it is larger than the sum of its proper divisors (25998952).

51997898 is a wasteful number, since it uses less digits than its factorization.

51997898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25998951.

The product of its digits is 1632960, while the sum is 56.

The square root of 51997898 is about 7210.9568019785. The cubic root of 51997898 is about 373.2460862944.

The spelling of 51997898 in words is "fifty-one million, nine hundred ninety-seven thousand, eight hundred ninety-eight".