51017587 has 4 divisors (see below), whose sum is σ = 51384760. Its totient is φ = 50650416.

The previous prime is 51017581. The next prime is 51017597. The reversal of 51017587 is 78571015.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51017587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51017581) 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, 183378 + ... + 183655.

It is an arithmetic number, because the mean of its divisors is an integer number (12846190).

Almost surely, 2^51017587 is an apocalyptic number.

51017587 is a deficient number, since it is larger than the sum of its proper divisors (367173).

51017587 is a wasteful number, since it uses less digits than its factorization.

51017587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367172.

The product of its (nonzero) digits is 9800, while the sum is 34.

The square root of 51017587 is about 7142.6596586986. The cubic root of 51017587 is about 370.8855995795.

The spelling of 51017587 in words is "fifty-one million, seventeen thousand, five hundred eighty-seven".