51439587 has 4 divisors (see below), whose sum is σ = 68586120. Its totient is φ = 34293056.

The previous prime is 51439561. The next prime is 51439589. The reversal of 51439587 is 78593415.

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 51439587 - 2¹¹ = 51437539 is a prime.

It is a super-2 number, since 2×51439587² = 5292062221461138, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51439589) 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, 8573262 + ... + 8573267.

It is an arithmetic number, because the mean of its divisors is an integer number (17146530).

Almost surely, 2^51439587 is an apocalyptic number.

51439587 is a deficient number, since it is larger than the sum of its proper divisors (17146533).

51439587 is a wasteful number, since it uses less digits than its factorization.

51439587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17146532.

The product of its digits is 151200, while the sum is 42.

The square root of 51439587 is about 7172.1396389083. The cubic root of 51439587 is about 371.9054057666.

The spelling of 51439587 in words is "fifty-one million, four hundred thirty-nine thousand, five hundred eighty-seven".