51339587 has 4 divisors (see below), whose sum is σ = 55288800. Its totient is φ = 47390376.

The previous prime is 51339571. The next prime is 51339601. The reversal of 51339587 is 78593315.

It is a happy number.

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 51339587 - 2⁴ = 51339571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51369587) 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, 1974587 + ... + 1974612.

It is an arithmetic number, because the mean of its divisors is an integer number (13822200).

Almost surely, 2^51339587 is an apocalyptic number.

51339587 is a deficient number, since it is larger than the sum of its proper divisors (3949213).

51339587 is a wasteful number, since it uses less digits than its factorization.

51339587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3949212.

The product of its digits is 113400, while the sum is 41.

The square root of 51339587 is about 7165.1648271341. The cubic root of 51339587 is about 371.6642512484.

The spelling of 51339587 in words is "fifty-one million, three hundred thirty-nine thousand, five hundred eighty-seven".