51131671 has 8 divisors (see below), whose sum is σ = 51559200. Its totient is φ = 50706432.

The previous prime is 51131651. The next prime is 51131677. The reversal of 51131671 is 17613115.

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

It is a cyclic number.

It is not a de Polignac number, because 51131671 - 2⁷ = 51131543 is a prime.

It is a super-2 number, since 2×51131671² = 5228895558504482, which contains 22 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 (51131677) 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, 113655 + ... + 114103.

It is an arithmetic number, because the mean of its divisors is an integer number (6444900).

Almost surely, 2^51131671 is an apocalyptic number.

51131671 is a deficient number, since it is larger than the sum of its proper divisors (427529).

51131671 is a wasteful number, since it uses less digits than its factorization.

51131671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1145.

The product of its digits is 630, while the sum is 25.

The square root of 51131671 is about 7150.6412999115. The cubic root of 51131671 is about 371.1618481918.

Adding to 51131671 its reverse (17613115), we get a palindrome (68744786).

The spelling of 51131671 in words is "fifty-one million, one hundred thirty-one thousand, six hundred seventy-one".