51894887 has 4 divisors (see below), whose sum is σ = 56612616. Its totient is φ = 47177160.

The previous prime is 51894881. The next prime is 51894907. The reversal of 51894887 is 78849815.

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 51894887 - 2⁸ = 51894631 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 (51894881) 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, 2358848 + ... + 2358869.

It is an arithmetic number, because the mean of its divisors is an integer number (14153154).

Almost surely, 2^51894887 is an apocalyptic number.

51894887 is a deficient number, since it is larger than the sum of its proper divisors (4717729).

51894887 is a wasteful number, since it uses less digits than its factorization.

51894887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4717728.

The product of its digits is 645120, while the sum is 50.

The square root of 51894887 is about 7203.8105888481. The cubic root of 51894887 is about 372.9994489518. Note that the first 3 decimals are identical.

The spelling of 51894887 in words is "fifty-one million, eight hundred ninety-four thousand, eight hundred eighty-seven".