63731 has 4 divisors (see below), whose sum is σ = 64464. Its totient is φ = 63000.

The previous prime is 63727. The next prime is 63737. The reversal of 63731 is 13736.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 63731 - 2² = 63727 is a prime.

It is a super-2 number, since 2×63731² = 8123280722, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (63737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215 + ... + 416.

It is an arithmetic number, because the mean of its divisors is an integer number (16116).

2⁶³⁷³¹ is an apocalyptic number.

63731 is a deficient number, since it is larger than the sum of its proper divisors (733).

63731 is a wasteful number, since it uses less digits than its factorization.

63731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732.

The product of its digits is 378, while the sum is 20.

The square root of 63731 is about 252.4499950485. The cubic root of 63731 is about 39.9438796328.

The spelling of 63731 in words is "sixty-three thousand, seven hundred thirty-one".