51698242 has 8 divisors (see below), whose sum is σ = 80221500. Its totient is φ = 24957744.

The previous prime is 51698239. The next prime is 51698249. The reversal of 51698242 is 24289615.

It can be written as a sum of positive squares in 2 ways, for example, as 50680161 + 1018081 = 7119^2 + 1009^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (51698249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 445617 + ... + 445732.

Almost surely, 2^51698242 is an apocalyptic number.

51698242 is a deficient number, since it is larger than the sum of its proper divisors (28523258).

51698242 is a wasteful number, since it uses less digits than its factorization.

51698242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891380.

The product of its digits is 34560, while the sum is 37.

The square root of 51698242 is about 7190.1489553416. The cubic root of 51698242 is about 372.5277177099.

The spelling of 51698242 in words is "fifty-one million, six hundred ninety-eight thousand, two hundred forty-two".