51617687 has 8 divisors (see below), whose sum is σ = 56374032. Its totient is φ = 46872000.

The previous prime is 51617663. The next prime is 51617711. The reversal of 51617687 is 78671615.

It is an interprime number because it is at equal distance from previous prime (51617663) and next prime (51617711).

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 51617687 - 2⁸ = 51617431 is a prime.

It is a super-2 number, since 2×51617687² = 5328771222459938, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51617087) 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, 10187 + ... + 14387.

It is an arithmetic number, because the mean of its divisors is an integer number (7046754).

Almost surely, 2^51617687 is an apocalyptic number.

51617687 is a deficient number, since it is larger than the sum of its proper divisors (4756345).

51617687 is a wasteful number, since it uses less digits than its factorization.

51617687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5329.

The product of its digits is 70560, while the sum is 41.

The square root of 51617687 is about 7184.5450099502. The cubic root of 51617687 is about 372.3341291140.

The spelling of 51617687 in words is "fifty-one million, six hundred seventeen thousand, six hundred eighty-seven".