51731663 has 8 divisors (see below), whose sum is σ = 54840240. Its totient is φ = 48630400.

The previous prime is 51731633. The next prime is 51731707. The reversal of 51731663 is 36613715.

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 51731663 - 2¹⁰ = 51730639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51731633) 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, 20948 + ... + 23286.

It is an arithmetic number, because the mean of its divisors is an integer number (6855030).

Almost surely, 2^51731663 is an apocalyptic number.

51731663 is a deficient number, since it is larger than the sum of its proper divisors (3108577).

51731663 is a wasteful number, since it uses less digits than its factorization.

51731663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3657.

The product of its digits is 11340, while the sum is 32.

The square root of 51731663 is about 7192.4726624437. The cubic root of 51731663 is about 372.6079755449.

The spelling of 51731663 in words is "fifty-one million, seven hundred thirty-one thousand, six hundred sixty-three".