51709471 has 6 divisors (see below), whose sum is σ = 56837816. Its totient is φ = 47008500.

The previous prime is 51709423. The next prime is 51709481. The reversal of 51709471 is 17490715.

It is a de Polignac number, because none of the positive numbers 2^k-51709471 is a prime.

It is a super-3 number, since 3×51709471³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51709421) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 213555 + ... + 213796.

Almost surely, 2^51709471 is an apocalyptic number.

51709471 is a deficient number, since it is larger than the sum of its proper divisors (5128345).

51709471 is a wasteful number, since it uses less digits than its factorization.

51709471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427373 (or 427362 counting only the distinct ones).

The product of its (nonzero) digits is 8820, while the sum is 34.

The square root of 51709471 is about 7190.9297729849. The cubic root of 51709471 is about 372.5546871048.

It can be divided in two parts, 5170 and 9471, that added together give a palindrome (14641).

The spelling of 51709471 in words is "fifty-one million, seven hundred nine thousand, four hundred seventy-one".