51706391 has 24 divisors (see below), whose sum is σ = 61722000. Its totient is φ = 42900480.

The previous prime is 51706337. The next prime is 51706397. The reversal of 51706391 is 19360715.

It is not a de Polignac number, because 51706391 - 2⁶ = 51706327 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 (51706397) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 114935 + ... + 115383.

It is an arithmetic number, because the mean of its divisors is an integer number (2571750).

Almost surely, 2^51706391 is an apocalyptic number.

51706391 is a deficient number, since it is larger than the sum of its proper divisors (10015609).

51706391 is a wasteful number, since it uses less digits than its factorization.

51706391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527 (or 508 counting only the distinct ones).

The product of its (nonzero) digits is 5670, while the sum is 32.

The square root of 51706391 is about 7190.7156111197. The cubic root of 51706391 is about 372.5472900639.

The spelling of 51706391 in words is "fifty-one million, seven hundred six thousand, three hundred ninety-one".