51698399 has 4 divisors (see below), whose sum is σ = 51889440. Its totient is φ = 51507360.

The previous prime is 51698393. The next prime is 51698401. The reversal of 51698399 is 99389615.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51698399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51698393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95114 + ... + 95655.

It is an arithmetic number, because the mean of its divisors is an integer number (12972360).

Almost surely, 2^51698399 is an apocalyptic number.

51698399 is a deficient number, since it is larger than the sum of its proper divisors (191041).

51698399 is a wasteful number, since it uses less digits than its factorization.

51698399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191040.

The product of its digits is 524880, while the sum is 50.

The square root of 51698399 is about 7190.1598730487. The cubic root of 51698399 is about 372.5280948135.

The spelling of 51698399 in words is "fifty-one million, six hundred ninety-eight thousand, three hundred ninety-nine".