51178987 has 8 divisors (see below), whose sum is σ = 52690176. Its totient is φ = 49682472.

The previous prime is 51178931. The next prime is 51178991. The reversal of 51178987 is 78987115.

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 51178987 - 2²³ = 42790379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51178087) 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, 3618 + ... + 10744.

It is an arithmetic number, because the mean of its divisors is an integer number (6586272).

Almost surely, 2^51178987 is an apocalyptic number.

51178987 is a deficient number, since it is larger than the sum of its proper divisors (1511189).

51178987 is a wasteful number, since it uses less digits than its factorization.

51178987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7337.

The product of its digits is 141120, while the sum is 46.

The square root of 51178987 is about 7153.9490493014. The cubic root of 51178987 is about 371.2763009327.

The spelling of 51178987 in words is "fifty-one million, one hundred seventy-eight thousand, nine hundred eighty-seven".