51689245 has 8 divisors (see below), whose sum is σ = 64028160. Its totient is φ = 40017360.

The previous prime is 51689219. The next prime is 51689249. The reversal of 51689245 is 54298615.

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

It is not a de Polignac number, because 51689245 - 2⁵ = 51689213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51689198 and 51689207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51689249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166585 + ... + 166894.

It is an arithmetic number, because the mean of its divisors is an integer number (8003520).

Almost surely, 2^51689245 is an apocalyptic number.

It is an amenable number.

51689245 is a deficient number, since it is larger than the sum of its proper divisors (12338915).

51689245 is a wasteful number, since it uses less digits than its factorization.

51689245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333515.

The product of its digits is 86400, while the sum is 40.

The square root of 51689245 is about 7189.5232804408. The cubic root of 51689245 is about 372.5061062314.

The spelling of 51689245 in words is "fifty-one million, six hundred eighty-nine thousand, two hundred forty-five".