51561671 has 6 divisors (see below), whose sum is σ = 59979960. Its totient is φ = 44195676.

The previous prime is 51561637. The next prime is 51561673. The reversal of 51561671 is 17616515.

It is not a de Polignac number, because 51561671 - 2¹⁴ = 51545287 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 (51561673) 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, 526091 + ... + 526188.

It is an arithmetic number, because the mean of its divisors is an integer number (9996660).

Almost surely, 2^51561671 is an apocalyptic number.

51561671 is a deficient number, since it is larger than the sum of its proper divisors (8418289).

51561671 is a wasteful number, since it uses less digits than its factorization.

51561671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052293 (or 1052286 counting only the distinct ones).

The product of its digits is 6300, while the sum is 32.

The square root of 51561671 is about 7180.6455837898. The cubic root of 51561671 is about 372.1993935291.

The spelling of 51561671 in words is "fifty-one million, five hundred sixty-one thousand, six hundred seventy-one".