51840871 has 4 divisors (see below), whose sum is σ = 54890352. Its totient is φ = 48791392.

The previous prime is 51840857. The next prime is 51840883. The reversal of 51840871 is 17804815.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51840871 - 2⁷ = 51840743 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 (51840821) 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, 1524715 + ... + 1524748.

It is an arithmetic number, because the mean of its divisors is an integer number (13722588).

Almost surely, 2^51840871 is an apocalyptic number.

51840871 is a deficient number, since it is larger than the sum of its proper divisors (3049481).

51840871 is a wasteful number, since it uses less digits than its factorization.

51840871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3049480.

The product of its (nonzero) digits is 8960, while the sum is 34.

The square root of 51840871 is about 7200.0604858570. The cubic root of 51840871 is about 372.8699889740.

The spelling of 51840871 in words is "fifty-one million, eight hundred forty thousand, eight hundred seventy-one".