51542187 has 4 divisors (see below), whose sum is σ = 68722920. Its totient is φ = 34361456.

The previous prime is 51542177. The next prime is 51542203. The reversal of 51542187 is 78124515.

51542187 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51542187 - 2⁴ = 51542171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51542137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8590362 + ... + 8590367.

It is an arithmetic number, because the mean of its divisors is an integer number (17180730).

Almost surely, 2^51542187 is an apocalyptic number.

51542187 is a deficient number, since it is larger than the sum of its proper divisors (17180733).

51542187 is a wasteful number, since it uses less digits than its factorization.

51542187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17180732.

The product of its digits is 11200, while the sum is 33.

The square root of 51542187 is about 7179.2887530730. The cubic root of 51542187 is about 372.1525056860.

The spelling of 51542187 in words is "fifty-one million, five hundred forty-two thousand, one hundred eighty-seven".