51706237 has 4 divisors (see below), whose sum is σ = 56406816. Its totient is φ = 47005660.

The previous prime is 51706229. The next prime is 51706267. The reversal of 51706237 is 73260715.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51706237 - 2³ = 51706229 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51706199 and 51706208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51706267) 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, 2350273 + ... + 2350294.

It is an arithmetic number, because the mean of its divisors is an integer number (14101704).

Almost surely, 2^51706237 is an apocalyptic number.

It is an amenable number.

51706237 is a deficient number, since it is larger than the sum of its proper divisors (4700579).

51706237 is a wasteful number, since it uses less digits than its factorization.

51706237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4700578.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 51706237 is about 7190.7049028590. The cubic root of 51706237 is about 372.5469202041.

The spelling of 51706237 in words is "fifty-one million, seven hundred six thousand, two hundred thirty-seven".