51178887 has 12 divisors (see below), whose sum is σ = 77139504. Its totient is φ = 32635680.

The previous prime is 51178873. The next prime is 51178909. The reversal of 51178887 is 78887115.

It is not a de Polignac number, because 51178887 - 2⁷ = 51178759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51178847) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 123414 + ... + 123827.

It is an arithmetic number, because the mean of its divisors is an integer number (6428292).

Almost surely, 2^51178887 is an apocalyptic number.

51178887 is a deficient number, since it is larger than the sum of its proper divisors (25960617).

51178887 is a wasteful number, since it uses less digits than its factorization.

51178887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247270 (or 247267 counting only the distinct ones).

The product of its digits is 125440, while the sum is 45.

The square root of 51178887 is about 7153.9420601512. The cubic root of 51178887 is about 371.2760591170.

The spelling of 51178887 in words is "fifty-one million, one hundred seventy-eight thousand, eight hundred eighty-seven".