51565257 has 12 divisors (see below), whose sum is σ = 74613760. Its totient is φ = 34316568.

The previous prime is 51565243. The next prime is 51565273. The reversal of 51565257 is 75256515.

It is a happy number.

It is not a de Polignac number, because 51565257 - 2⁶ = 51565193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51565357) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 744 + ... + 10182.

Almost surely, 2^51565257 is an apocalyptic number.

It is an amenable number.

51565257 is a deficient number, since it is larger than the sum of its proper divisors (23048503).

51565257 is a wasteful number, since it uses less digits than its factorization.

51565257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10052 (or 10049 counting only the distinct ones).

The product of its digits is 52500, while the sum is 36.

The square root of 51565257 is about 7180.8952784454. The cubic root of 51565257 is about 372.2080218768.

The spelling of 51565257 in words is "fifty-one million, five hundred sixty-five thousand, two hundred fifty-seven".